# User Guide - [Environments](https://docs.lenses.io/latest/devx/6.1/user-guide/environments.md): This page describes Environments in Lenses. - [Lenses Resource Names (LRNs)](https://docs.lenses.io/latest/devx/6.1/user-guide/lrn.md): LRNs uniquely identify all resources that Lenses understands. Examples are a Lenses User, a Kafka topic or a Kafka-Connect connector. - [Identity & Access Management](https://docs.lenses.io/latest/devx/6.1/user-guide/iam.md): This page describes Identity & Access Management (IAM) in Lenses. - [Overview](https://docs.lenses.io/latest/devx/6.1/user-guide/iam/overview.md): This page describes an overview of Lenses IAM (Identity & Access Management) - [Users](https://docs.lenses.io/latest/devx/6.1/user-guide/iam/users.md): This page describes Users in Lenses. - [Groups](https://docs.lenses.io/latest/devx/6.1/user-guide/iam/groups.md): This page describes IAM groups in Lenses. - [Roles](https://docs.lenses.io/latest/devx/6.1/user-guide/iam/roles.md): This page describes Roles in Lenses. - [Service Accounts](https://docs.lenses.io/latest/devx/6.1/user-guide/iam/service-accounts.md): This page describes service accounts in Lenses. - [IAM Reference](https://docs.lenses.io/latest/devx/6.1/user-guide/iam/iam-reference.md): This page describes the IAM Reference options. - [Example Policies](https://docs.lenses.io/latest/devx/6.1/user-guide/iam/example-policies.md): This section provides example IAM policies for Lenses. - [Topics](https://docs.lenses.io/latest/devx/6.1/user-guide/topics.md): This page describes exploring topics in Lenses. - [Global Topic Catalogue](https://docs.lenses.io/latest/devx/6.1/user-guide/topics/global-topic-catalogue.md): Learn how to find topics across all your environments. - [Environment Topic Catalogue](https://docs.lenses.io/latest/devx/6.1/user-guide/topics/environment-topic-catalogue.md): Allow users to create and manage their topics and apply topic settings as guard rails. - [Finding topics & fields](https://docs.lenses.io/latest/devx/6.1/user-guide/topics/environment-topic-catalogue/finding-topics-and-fields.md): This page describes how to use Lenses to search for topics and fields across Kafka, Postgres and Elasticsearch. - [Searching for messages](https://docs.lenses.io/latest/devx/6.1/user-guide/topics/environment-topic-catalogue/searching-for-messages.md): This page describes how to use Lenses to use the Explore screen to explore, search and debug messages in a topic. - [Inserting & deleting messages](https://docs.lenses.io/latest/devx/6.1/user-guide/topics/environment-topic-catalogue/inserting-and-deleting-messages.md): This page describes how to use Lenses to insert or delete messages in Kafka. - [Viewing topic metrics](https://docs.lenses.io/latest/devx/6.1/user-guide/topics/environment-topic-catalogue/viewing-topic-metrics.md): This page describes how to use Lenses to view metrics for a topic. - [Viewing topic partitions](https://docs.lenses.io/latest/devx/6.1/user-guide/topics/environment-topic-catalogue/viewing-topic-partitions.md): This page describes how to use Lenses to view topic partition metrics and configuration. - [Topic Settings](https://docs.lenses.io/latest/devx/6.1/user-guide/topics/environment-topic-catalogue/topic-settings.md): This page describes how to use Lenses topic settings to provide governance when creating topics in your Kafka cluster. - [Adding metadata & tags to topics](https://docs.lenses.io/latest/devx/6.1/user-guide/topics/environment-topic-catalogue/adding-metadata-and-tags-to-topics.md): This page describes how to use Lenses to add metadata and tags to topics in Kafka. - [Managing topic configurations](https://docs.lenses.io/latest/devx/6.1/user-guide/topics/environment-topic-catalogue/managing-topic-configurations.md): This page describes how to use Lenses to view and manage topic configurations in Kafka. - [Approval requests](https://docs.lenses.io/latest/devx/6.1/user-guide/topics/environment-topic-catalogue/approval-requests.md): This page describes how to use Lenses approval requests. - [Downloading messages](https://docs.lenses.io/latest/devx/6.1/user-guide/topics/environment-topic-catalogue/downloading-messages.md): This page describes how to use Lenses to download messages to CSV or JSON from a Kafka topic. - [Backup & Restore](https://docs.lenses.io/latest/devx/6.1/user-guide/topics/environment-topic-catalogue/backup-and-restore.md): This page describes how to use Lenses to back and restore data in a Kafka topic to AWS S3. - [SQL Studio](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-studio.md): A declarative SQL interface, for querying, transforming and manipulating data at rest and data in motion. It works with Apache Kafka topics and other data sources. It helps developers and Kafka users - [Concepts](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-studio/concepts.md): This page describes the concepts of the Lenses SQL snapshot engine that drives the SQL Studio allowing you to query data in Kafka. - [Best practices](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-studio/best-practices.md): This page describes the best practices when using Lenses SQL Studio to query data in Kafka. - [Filter by timestamp or offset](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-studio/filter-by-timestamp-or-offset.md): This page describes how to view the most recents messages in Lenses. - [Creating & deleting Kafka topics](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-studio/creating-and-deleting-kafka-topics.md): This page describes how to create and delete topics in the Lenses SQL Studio. - [Filtering](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-studio/filtering.md): This page describes common filtering of data in Kafka with Lenses SQL Studio. - [Limit & Sampling](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-studio/limit-and-sampling.md): This page describes how to limit return and sample data in Kafka with Lenses SQL Studio. - [Joins](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-studio/joins.md): This page describes joining data in Kafka with Lenses SQL Studio. - [Inserting & deleting data](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-studio/inserting-and-deleting-data.md): This page describes how to insert and delete data into Kafka with Lenses SQL Studio. - [Aggregations](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-studio/aggregations.md): This page describes how to aggregate Kafka data in Lenses SQL Studio. - [Metadata fields](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-studio/metadata-fields.md): This page describes access Kafka message metadata in Lenses SQL Studio. - [Views & synonyms](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-studio/views-and-synonyms.md): This page describes how to use views and synonyms in Lenses SQL Studio to query Kafka. - [Arrays](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-studio/arrays.md): This page describes examples of using arrays in Lenses SQL Studio to query Kafka. - [Managing queries](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-studio/managing-queries.md): This page describes how to manage and control queries against Kafka in Lenses SQL Studio. - [Applications](https://docs.lenses.io/latest/devx/6.1/user-guide/applications.md): This page describes managing Kafka Connectors, SQL Processors and External Apps in Lenses. - [Kafka Connections](https://docs.lenses.io/latest/devx/6.1/user-guide/applications/kafka-connections.md): This page describes how to manage Kafka Connections in Lenses. - [Kafka to Kafka Replicator](https://docs.lenses.io/latest/devx/6.1/user-guide/applications/kafka-to-kafka-replicator.md): This page describes how to manage Kafka to Kafka data replication in Lenses. - [Authorization Guide](https://docs.lenses.io/latest/devx/6.1/user-guide/applications/kafka-to-kafka-replicator/authorization-guide.md): This guide explains how authorization works for Kafka-to-Kafka (K2K) replication applications in Lenses. K2K apps replicate data between Kafka clusters across different environments, and this document - [Connectors](https://docs.lenses.io/latest/devx/6.1/user-guide/applications/connectors.md): This page describes how Lenses integrates with Kafka Connect to create, manage, and monitor connectors via multiple connect clusters. - [Overview](https://docs.lenses.io/latest/devx/6.1/user-guide/applications/connectors/overview.md): This page describes an overview of managing Kafka Connectors in Lenses. - [Sources](https://docs.lenses.io/latest/devx/6.1/user-guide/applications/connectors/sources.md): This page describes the available Apache 2.0 Source Connectors from Lenses. Lenses can also work with any other Kafka Connect Connector. - [Sinks](https://docs.lenses.io/latest/devx/6.1/user-guide/applications/connectors/sinks.md): This page describes the available Apache 2.0 Sink Connectors from Lenses. Lenses can also work with any other Kafka Connect Connector. - [Secret Providers](https://docs.lenses.io/latest/devx/6.1/user-guide/applications/connectors/secret-providers.md): This page describes the available Apache 2.0 Connect Secret Providers from Lenses. - [SQL Processors](https://docs.lenses.io/latest/devx/6.1/user-guide/applications/sql-processors.md): This page describes creating and managing SQL Processors in Lenses. - [Concepts](https://docs.lenses.io/latest/devx/6.1/user-guide/applications/sql-processors/concepts.md): This page describes the concepts of Lenses SQL Processors from joining, aggregating and filtering data in Kafka. - [Projections](https://docs.lenses.io/latest/devx/6.1/user-guide/applications/sql-processors/projections.md): This page describes using projections for data in Kafka with Lenses SQL Processors. - [Joins](https://docs.lenses.io/latest/devx/6.1/user-guide/applications/sql-processors/joins.md): This page describes how to join data in Kafka with in Lenses SQL Processors. - [Lateral Joins](https://docs.lenses.io/latest/devx/6.1/user-guide/applications/sql-processors/lateral-joins.md): This page describes how to use lateral joins for data in Kafka with Lenses SQL Processors. - [Aggregations](https://docs.lenses.io/latest/devx/6.1/user-guide/applications/sql-processors/aggregations.md): This page describes how to aggregate data in Kafka with Lenses SQL Processors. - [Time & Windows](https://docs.lenses.io/latest/devx/6.1/user-guide/applications/sql-processors/time-and-windows.md): This page describes the time and windowing of data in Kafka with Lenses SQL Processors. - [Storage format](https://docs.lenses.io/latest/devx/6.1/user-guide/applications/sql-processors/storage-format.md): This page describes the storage formats of data in Kaka supported by Lenses SQL Processors. - [Nullibility](https://docs.lenses.io/latest/devx/6.1/user-guide/applications/sql-processors/nullibility.md): This page describes handling nulls values in Kafka data with Lenses SQL Processors. - [Settings](https://docs.lenses.io/latest/devx/6.1/user-guide/applications/sql-processors/settings.md): This page describes using settings in Lenses SQL Processors to process data in Kafka. - [External Applications](https://docs.lenses.io/latest/devx/6.1/user-guide/applications/external-applications.md): This page describes external applications in Lenses. - [Registering via SDK](https://docs.lenses.io/latest/devx/6.1/user-guide/applications/external-applications/registering-via-sdk.md): This page describes using the Lenses Java SDK to register your own applications with Lenses. - [Registering via REST](https://docs.lenses.io/latest/devx/6.1/user-guide/applications/external-applications/registring-via-rest.md): This page describes using the Lenses Rest endpoints to register your own applications with Lenses. - [Registering via Web UI](https://docs.lenses.io/latest/devx/6.1/user-guide/applications/external-applications/registering-via-web-ui.md) - [Schemas](https://docs.lenses.io/latest/devx/6.1/user-guide/schemas.md): This page describes how to manage Schema in a Schema Registry with Lenses. - [Monitoring & Alerting](https://docs.lenses.io/latest/devx/6.1/user-guide/monitoring-and-alerting.md): This section describes the monitoring and alerting features of Lenses. - [Infrastructure Health](https://docs.lenses.io/latest/devx/6.1/user-guide/monitoring-and-alerting/infrastructure-health.md): Monitoring the health of your infrastructure. - [Alerting](https://docs.lenses.io/latest/devx/6.1/user-guide/monitoring-and-alerting/alerting.md): This section describes how to configure alerting in Lenses. - [Alert Reference](https://docs.lenses.io/latest/devx/6.1/user-guide/monitoring-and-alerting/alerting/alert-reference.md): This page describes the alert references for Lenses. - [Integrations](https://docs.lenses.io/latest/devx/6.1/user-guide/monitoring-and-alerting/integrations.md): This section describes the integrations available for alerting. - [Consumer Groups](https://docs.lenses.io/latest/devx/6.1/user-guide/monitoring-and-alerting/consumer-groups.md): This page described consumer group monitoring. - [Self Service & Governance](https://docs.lenses.io/latest/devx/6.1/user-guide/self-service-and-governance.md): This page describes how to use Lenses Self serivce and governance features for Kafka. - [Data policies](https://docs.lenses.io/latest/devx/6.1/user-guide/self-service-and-governance/data-policies.md): This page describes how to use Lenses to create data policies to identify and mask data in Lenses as well as identify applications consuming them. - [Audits](https://docs.lenses.io/latest/devx/6.1/user-guide/self-service-and-governance/audits.md): This page describes how to use Lenses to enable auditing to track every action in Lenses. - [Kafka ACLs](https://docs.lenses.io/latest/devx/6.1/user-guide/self-service-and-governance/kafka-acls.md): This page describes how to use Lenses to apply Kafka ACLs for Kafka Clients. - [Kafka Quotas](https://docs.lenses.io/latest/devx/6.1/user-guide/self-service-and-governance/kafka-quotas.md): This page describes how to use Lenses to enable Kafka Quotas to ensure applications are well-behaved. - [Topology](https://docs.lenses.io/latest/devx/6.1/user-guide/topology.md): This page describes how to use Lenses to view and manage your application landscape on Kafka. - [Tutorials](https://docs.lenses.io/latest/devx/6.1/user-guide/tutorials.md) - [SQL Processors](https://docs.lenses.io/latest/devx/6.1/user-guide/tutorials/sql-processors.md) - [Data formats](https://docs.lenses.io/latest/devx/6.1/user-guide/tutorials/sql-processors/data-formats.md) - [Changing data formats](https://docs.lenses.io/latest/devx/6.1/user-guide/tutorials/sql-processors/data-formats/changing-data-formats.md): Tutorial on how to change the format of data in a Kafka topic from JSON to AVRO with Lenses SQL Processors. - [Rekeying data](https://docs.lenses.io/latest/devx/6.1/user-guide/tutorials/sql-processors/data-formats/rekeying-data.md): This page describes a tutorial to rekey data in a Kafka topic with Lenses SQL Processors. - [Controlling AVRO record names and namespaces](https://docs.lenses.io/latest/devx/6.1/user-guide/tutorials/sql-processors/data-formats/controlling-avro-record-names-and-namespaces.md): This page a tutorial to control AVRO record names and namespaces with Lenses SQL Processors. - [Changing the shape of data](https://docs.lenses.io/latest/devx/6.1/user-guide/tutorials/sql-processors/data-formats/changing-the-shape-of-data.md): This page describe a tutorial to change the shape (fields) of data in a Kafka topic using Lenses SQL Processors. - [Filtering & Joins](https://docs.lenses.io/latest/devx/6.1/user-guide/tutorials/sql-processors/filtering-and-joins.md) - [Filtering data](https://docs.lenses.io/latest/devx/6.1/user-guide/tutorials/sql-processors/filtering-and-joins/filtering-data.md): This page describes a tutorial to filter records in a Kafka topic with Lenses SQL Processors. - [Enriching data streams](https://docs.lenses.io/latest/devx/6.1/user-guide/tutorials/sql-processors/filtering-and-joins/enriching-data-streams.md): This page describes a tutorial to enrich a Kafka topic using Lenses SQL Processors. - [Joining streams of data](https://docs.lenses.io/latest/devx/6.1/user-guide/tutorials/sql-processors/filtering-and-joins/joining-streams-of-data.md): This page describes a tutorial joining Kafka topics with Lenses SQL Processors. - [Using multiple topics](https://docs.lenses.io/latest/devx/6.1/user-guide/tutorials/sql-processors/filtering-and-joins/using-multiple-topics.md): This page describes a tutorial to use multiple Kafka topics in a Lenses SQL Processor. - [Aggregations](https://docs.lenses.io/latest/devx/6.1/user-guide/tutorials/sql-processors/aggregations.md) - [Aggregating data in a table](https://docs.lenses.io/latest/devx/6.1/user-guide/tutorials/sql-processors/aggregations/aggregating-data-in-a-table.md): This page describes a tutorial to aggregate Kafka topic data into a table using Lenses SQL Processors. - [Aggregating streams](https://docs.lenses.io/latest/devx/6.1/user-guide/tutorials/sql-processors/aggregations/aggregating-streams.md): This page describes a tutorial to aggregate data Kafka topic data into a stream using Lenses SQL Processors - [Time window aggregations](https://docs.lenses.io/latest/devx/6.1/user-guide/tutorials/sql-processors/aggregations/time-window-aggregations.md): This page describes a tutorial to perform time windowed aggregations on Kafka topic data with Lenses SQL Processors. - [Complex types](https://docs.lenses.io/latest/devx/6.1/user-guide/tutorials/sql-processors/complex-types.md) - [Unwrapping complex types](https://docs.lenses.io/latest/devx/6.1/user-guide/tutorials/sql-processors/complex-types/unwrapping-complex-types.md): This page describes a tutorial to unwrap a complex data type in a Kafka topic using Lenses SQL Processors. - [Working with Arrays](https://docs.lenses.io/latest/devx/6.1/user-guide/tutorials/sql-processors/complex-types/working-with-arrays.md): This page describes a tutorial on how to work with array data in your Kafka topics using Lenses SQL Processors. - [Controlling event time](https://docs.lenses.io/latest/devx/6.1/user-guide/tutorials/sql-processors/controlling-event-time.md): This describes how to control event time for data in your Kafka topics with Lenses SQL Processors. - [SQL Studio](https://docs.lenses.io/latest/devx/6.1/user-guide/tutorials/sql-studio.md) - [Querying data](https://docs.lenses.io/latest/devx/6.1/user-guide/tutorials/sql-studio/querying-data.md): This page describes a tutorial for querying data with SQL Studio. - [Accessing headers](https://docs.lenses.io/latest/devx/6.1/user-guide/tutorials/sql-studio/accessing-headers.md): This page describes a tutorial for access headers via SQL Studio. - [Deleting data from compacted topics](https://docs.lenses.io/latest/devx/6.1/user-guide/tutorials/sql-studio/deleting-data-from-compacted-topics.md): This page describes a tutorial for deleting data in compacted topics from SQL Studio. - [Working with JSON](https://docs.lenses.io/latest/devx/6.1/user-guide/tutorials/sql-studio/working-with-json.md): This page describes a tutorial on how to work with JSON in Lenses SQL. - [SQL Reference](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference.md): This page describes the SQL Reference for Lenses SQL Processors for data in Kafka. - [Expressions](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/expressions.md): This page describes the expressions in Lenses SQL Processors. - [Functions](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions.md): This page describes how to use functions in Lenses SQL Processors. - [Aggregate](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/aggregate.md): This section describes how to use AGGREGATE functions in Lenses SQL. - [AVG](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/aggregate/avg.md): This page describes the AVG function in Lenses SQL. - [BOTTOMK](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/aggregate/bottomk.md): This page describes the BOTTOMK function in Lenses SQL. - [COLLECT](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/aggregate/collect.md): This page describe the COLLECT function in Lenses SQL. - [COLLECT\_UNIQUE](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/aggregate/collect_unique.md): This page describes the COLLECT\_UNIQUE function in Lenses SQL. - [COUNT](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/aggregate/count.md): This page describes the COUNT function in Lenses SQL. - [FIRST](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/aggregate/first.md): This page describes the FIRST function in Lenses SQL. - [LAST](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/aggregate/last.md): This page describes the LAST function in Lenses SQL. - [MAXK](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/aggregate/maxk.md): This page describes the MAXK function in Lenses SQL. - [MAXK\_UNIQUE](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/aggregate/maxk_unique.md): This page describes the MAXK\_UNIQUE function in Lenses SQL. - [MINK](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/aggregate/mink.md): This page describes the MINK function in Lenses SQL. - [MINK\_UNIQUE](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/aggregate/mink_unique.md): This page describes the MINK\_UNIQUE function in Lenses SQL. - [SUM](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/aggregate/sum.md): This page describes the SUM function in Lenses SQL. - [TOPK](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/aggregate/topk.md): This page describes the TOPK function in Lenses SQL. - [Array](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/array.md): This page describes how to use ARRAY functions in Lenses SQL Processors. - [ELEMENT\_OF](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/array/element_of.md): This page describes the ELEMENT\_OF function in Lenses SQL. - [FLATTEN](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/array/flatten.md): This page describes the FLATTEN function in Lenses SQL. - [IN\_ARRAY](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/array/in_array.md): This page describes the IN\_ARRAY function in Lenses SQL. - [REPEAT](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/array/repeat.md): This page describes the REPEAT function in Lenses SQL. - [SIZEOF](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/array/sizeof.md): This page describes the SIZEOF function in Lenses SQL. - [ZIP\_ALL](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/array/zip_all.md): This page describes the ZIP\_ALL function in Lenses SQL. - [ZIP](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/array/zip.md): This page describes the ZIP function in Lenses SQL. - [Conditions](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/conditions.md): This page describes how to use Conditions in Lenses SQL Processors. - [Conversion](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/conversion.md): This page describes how to use conversion or CAST functions in Lenses SQL Processors. - [Date & Time](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/date-and-time.md): This page describes how to use date and time functions in Lenses SQL Processors. - [CONVERT\_DATETIME](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/date-and-time/convert_datetime.md): This page describes the CONVERT\_DATETIME function in Lenses SQL. - [DATE](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/date-and-time/date.md): This page describes the DATE function in Lenses SQL. - [DATETIME](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/date-and-time/datetime.md): This page describes the DATETIME function in Lenses SQL. - [EXTRACT\_TIME](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/date-and-time/extract_time.md): This page describes the EXTRACT\_TIME function in Lenses SQL. - [EXTRACT\_DATE](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/date-and-time/extract_date.md): This page describes the EXTRACT\_DATE function in Lenses SQL. - [FORMAT\_DATE](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/date-and-time/format_date.md): This page describes the FORMAT\_DATE function in Lenses SQL. - [FORMAT\_TIME](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/date-and-time/format_time.md): This page describes the FORMAT\_TIME function in Lenses SQL. - [FORMAT\_TIMESTAMP](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/date-and-time/format_timestamp.md): This page describes the FORMAT\_TIMESTAMP function in Lenses SQL. - [HOUR](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/date-and-time/hour.md): This page describes the HOUR function in Lenses SQL. - [MONTH\_TEXT](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/date-and-time/month_text.md): This page describes the MONTH\_TEXT function in Lenses SQL. - [MINUTE](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/date-and-time/minute.md): This page describes the MINUTE function in Lenses SQL. - [MONTH](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/date-and-time/month.md): This page describes the MONTH function in Lenses SQL. - [PARSE\_DATE](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/date-and-time/parse_date.md): This page describes the PARSE\_DATE function in Lenses SQL. - [PARSE\_TIME\_MILLIS](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/date-and-time/parse_time_millis.md): This page describes the PARSE\_TIME\_MILLIS function in Lenses SQL. - [PARSE\_TIME\_MICROS](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/date-and-time/parse_time_micros.md): This page describes the PARSE\_TIME\_MICROS function in Lenses SQL. - [PARSE\_TIMESTAMP\_MILLIS](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/date-and-time/parse_timestamp_millis.md): This page describes the PARSE\_TIMESTAMP\_MILLIS function in Lenses SQL. - [PARSE\_TIMESTAMP\_MICROS](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/date-and-time/parse_timestamp_micros.md): This page describes the PARSE\_TIMESTAMP\_MICROS function in Lenses SQL. - [SECOND](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/date-and-time/second.md): This page describes the SECOND function in Lenses SQL. - [TIMESTAMP](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/date-and-time/timestamp.md): This page describes the TIMESTAMP function in Lenses SQL. - [TIME\_MICROS](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/date-and-time/time_micros.md): This page describes the TIME\_MICROS function in Lenses SQL. - [TIMESTAMP\_MICROS](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/date-and-time/timestamp_micros.md): This page describes the TIMESTAMP\_MICROS function in Lenses SQL. - [TIME\_MILLIS](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/date-and-time/time_millis.md): This page describes the TIME\_MILLIS function in Lenses SQL. - [TIMESTAMP\_MILLIS](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/date-and-time/timestamp_millis.md): This page describes the TIMESTAMP\_MILLIS function in Lenses SQL. - [TO\_DATE](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/date-and-time/to_date.md): This page describes the TO\_DATE function in Lenses SQL. - [TO\_DATETIME](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/date-and-time/to_datetime.md): This page describes the TO\_DATETIME function in Lenses SQL. - [TOMORROW](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/date-and-time/tomorrow.md): This page describes the TOMORROW function in Lenses SQL. - [TO\_TIMESTAMP](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/date-and-time/to_timestamp.md): This page describes the TO\_TIMESTAMP function in Lenses SQL. - [YEAR](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/date-and-time/year.md): This page describes the YEAR function in Lenses SQL. - [YESTERDAY](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/date-and-time/yesterday.md): This page describes the YESTERDAY function in Lenses SQL. - [Headers](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/headers.md): This page describes how to use HEADER functions in Lenses SQL Processors. - [HEADERASSTRING](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/headers/headerasstring.md): This page describes the HEADERASSTRING function in Lenses SQL. - [HEADERASINT](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/headers/headerasint.md): This page describes the HEADERASINT function in Lenses SQL. - [HEADERASLONG](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/headers/headeraslong.md): This page describes the HEADERASLONG function in Lenses SQL. - [HEADERASDOUBLE](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/headers/headerasdouble.md): This page describes the HEADERASDOUBLE function in Lenses SQL. - [HEADERASFLOAT](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/headers/headerasfloat.md): This page describes the HEADERASFLOAT function in Lenses SQL. - [HEADERKEYS](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/headers/headerkeys.md): This page describes the HEADERKEYS function in Lenses SQL. - [JSON](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/json.md): This page describes the JSON functions in Lenses SQL. - [JSON\_EXTRACT\_FIRST](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/json/json_extract_first.md): This page describes the JSON\_EXTRACT\_FIRST function in Lenses SQL. - [JSON\_EXTRACT\_ALL](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/json/json_extract_all.md): This page describes the JSON\_EXTRACT\_ALL function in Lenses SQL. - [Numeric](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/numeric.md): This page describes how to use numeric functions in Lenses SQL Processors. - [ABS](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/numeric/abs.md): This page describes the ABS function in Lenses SQL. - [ACOS](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/numeric/acos.md): This page describes the ACOS function in Lenses SQL. - [ASIN](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/numeric/asin.md): This page describes the ASIN function in Lenses SQL. - [ATAN](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/numeric/atan.md): This page describes the ATAN function in Lenses SQL. - [CBRT](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/numeric/cbrt.md): This page describes the CBRT function in Lenses SQL. - [CEIL](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/numeric/ceil.md): This page describes the CEIL function in Lenses SQL. - [COSH](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/numeric/cosh.md): This page describes the COSH function in Lenses SQL. - [COS](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/numeric/cos.md): This page describes the COS function in Lenses SQL. - [DEGREES](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/numeric/degrees.md): This page describes the DEGRESS function in Lenses SQL. - [DISTANCE](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/numeric/distance.md): This page describes the DISTANCE function in Lenses SQL. - [FLOOR](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/numeric/floor.md): This page describes the FLOOR function in Lenses SQL. - [MAX](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/numeric/max.md): This page describes the MAX function in Lenses SQL. - [MIN](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/numeric/min.md): This page describes the MIN function in Lenses SQL. - [MOD](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/numeric/mod.md): This page describes the MOD function in Lenses SQL. - [NEG](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/numeric/neg.md): This page describes the NEG function in Lenses SQL. - [POW](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/numeric/pow.md): This page describes the POW function in Lenses SQL. - [RADIANS](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/numeric/radians.md): This page describes the RADIANS function in Lenses SQL. - [RANDINT](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/numeric/randint.md): This page describes the RANDINT function in Lenses SQL. - [ROUND](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/numeric/round.md): This page describes the ROUND function in Lenses SQL. - [SIGN](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/numeric/sign.md): This page describes the SIGN function in Lenses SQL. - [SINH](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/numeric/sinh.md): This page describes the SINH function in Lenses SQL. - [SIN](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/numeric/sin.md): This page describes the SIN function in Lenses SQL. - [SQRT](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/numeric/sqrt.md): This page describes the SQRT function in Lenses SQL. - [TANH](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/numeric/tanh.md): This page describes the TANH function in Lenses SQL. - [TAN](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/numeric/tan.md): This page describes the TAN function in Lenses SQL. - [Nulls](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/nulls.md): This page describes how to use NULL functions in Lenses SQL Processors. - [ISNULL](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/nulls/isnull.md): This page describes the ISNULL function in Lenses SQL. - [ISNOTNULL](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/nulls/isnotnull.md): This page describes the ISNOTNULL function in Lenses SQL. - [COALESCE](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/nulls/coalesce.md): This page describes the COALESCE function in Lenses SQL. - [AS\_NULLABLE](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/nulls/as_nullable.md): This page describes the AS\_NULLABLE function in Lenses SQL. - [AS\_NON\_NULLABLE](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/nulls/as_non_nullable.md): This page describes the AS\_NON\_NULLABLE function in Lenses SQL. - [Obfuscation](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/obfuscation.md): This page describes how to use obfuscation functions in Lenses SQL Processors. - [ANONYMIZE](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/obfuscation/anonymize.md): This page describes the ANONYMIZE function in Lenses SQL. - [MASK](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/obfuscation/mask.md): This page describes the MASK function in Lenses SQL. - [EMAIL](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/obfuscation/email.md): This page describes the EMAIL function in Lenses SQL. - [FIRST1](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/obfuscation/first1.md): This page describe the FIRST1 function in Lenses SQL. - [FIRST2](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/obfuscation/first2.md): This page describes the FIRST2 function in Lenses SQL. - [FIRST3](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/obfuscation/first3.md): This page describes the FIRST3 function in Lenses SQL. - [FIRST4](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/obfuscation/first4.md): This page describes the FIRST4 function in Lenses SQL. - [LAST1](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/obfuscation/last1.md): This page describes the LAST1 function in Lenses SQL. - [LAST2](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/obfuscation/last2.md): This page describes the LAST2 function in Lenses SQL. - [LAST3](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/obfuscation/last3.md): This page describes the LAST3 function in Lenses SQL. - [LAST4](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/obfuscation/last4.md): This page describes the LAST4 function in Lenses SQL. - [INITIALS](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/obfuscation/initials.md): This page describes the INITALS function in Lenses SQL. - [Offsets](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/offsets.md): This page describes how to use offset functions in Lenses SQL Processors. - [Schema](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/schema.md): This page describes how to use schema functions in Lenses SQL Processors. - [TYPEOF](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/schema/typeof.md): This page describes the TYPEOF function in Lenses SQL. - [DUMP](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/schema/dump.md): This page describes the DUMP function in Lenses SQL. - [String](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/string.md): This page describes how to use string functions in Lenses SQL Processors. - [ABBREVIATE](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/string/abbreviate.md): This page describes the ABBREVIATE function in Lenses SQL. - [BASE64](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/string/base64.md): This page describes the BASE64function in Lenses SQL. - [CAPITALIZE](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/string/capitalize.md): This page describes the CAPITALIZE function in Lenses SQL. - [CENTER](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/string/center.md): This page describes the CENTER function in Lenses SQL. - [CHOP](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/string/chop.md): This page describes the CHOP function in Lenses SQL. - [CONCAT](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/string/concat.md): This page describes the CONCAT function in Lenses SQL. - [CONTAINS](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/string/contains.md): This page describes the CONTAINS function in Lenses SQL. - [DECODE64](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/string/decode64.md): This page describes the DECODE64 function in Lenses SQL. - [DELETEWHITESPACE](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/string/deletewhitespace.md): This page describes the DELETEWHITESPACE function in Lenses SQL. - [DIGITS](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/string/digits.md): This page describes the DIGITS function in Lenses SQL. - [DROPLEFT](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/string/dropleft.md): This page describes the DROPLEFT function in Lenses SQL. - [DROPRIGHT](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/string/dropright.md): This page describes the DROPRIGHT function in Lenses SQL. - [ENDSWITH](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/string/endswith.md): This page describes the ENDSWITH function in Lenses SQL. - [INDEXOF](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/string/indexof.md): This page describes the INDEXOF function in Lenses SQL. - [LEN](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/string/len.md): This page describes the LEN function in Lenses SQL. - [LOWER](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/string/lower.md): This page describes the LOWER function in Lenses SQL. - [LPAD](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/string/lpad.md): This page describes the LPAD function in Lenses SQL. - [MKSTRING](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/string/mkstring.md): This page describes the MKSTRING function in Lenses SQL. - [REGEXP](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/string/regexp.md): This page describes the REGEXP function in Lenses SQL. - [REGEX\_MATCHES](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/string/regex_matches.md): This page describes the REGEX\_MATCHES function in Lenses SQL. - [REPLACE](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/string/replace.md): This page describes the REPLACE function in Lenses SQL. - [REVERSE](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/string/reverse.md): This page describes the REVERSE function in Lenses SQL. - [RPAD](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/string/rpad.md): This page describes the REGEX\_MATCHES function in Lenses SQL. - [STARTSWITH](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/string/startswith.md): This page describes the STARTSWITH function in Lenses SQL. - [STRIPACCENTS](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/string/stripaccents.md): This page describes the STRIPACCENTS function in Lenses SQL. - [SUBSTR](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/string/substr.md): This page describes the SUBSTR function in Lenses SQL. - [SWAPCASE](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/string/swapcase.md): This page describes the SWAPCASE function in Lenses SQL. - [TAKELEFT](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/string/takeleft.md): This page describes the TAKELEFT function in Lenses SQL. - [TAKERIGHT](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/string/takeright.md): This page describes the TAKERIGHT function in Lenses SQL. - [TRIM](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/string/trim.md): This page describes the TRIM function in Lenses SQL. - [TRUNCATE](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/string/truncate.md): This page describes the TRUNCATE function in Lenses SQL. - [UNCAPITALIZE](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/string/uncapitalize.md): This page describes the UNCAPITALIZE function in Lenses SQL. - [UPPER](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/string/upper.md): This page describes the UPPER function in Lenses SQL. - [UUID](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/string/uuid.md): This page describes the UUID function in Lenses SQL. - [User Defined Functions](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/user-defined-functions.md): This page describes how to write UDFs for Lenses SQL. - [User Defined Aggregate Functions](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/functions/user-defined-aggregate-functions.md): This page describes how to use User defined functions in Lenses SQL Processors. - [Deserializers](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/deserializers.md): This page describes how to use deserializers in Lenses. - [Supported data formats](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/supported-data-formats.md): This page describes the support data formats for the Lenses SQL engines. - [Protobuf](https://docs.lenses.io/latest/devx/6.1/user-guide/sql-reference/supported-data-formats/protobuf.md): This page describes how to use Profobuf with Lenses. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.lenses.io/latest/devx/6.1/user-guide.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.