# ISNOTNULL

```
ISNOTNULL(expr)
```

Returns true if the input is not null; false otherwise.

Available in:

| Processors | SQL Studio |
| ---------- | ---------- |
| ✓          | ✓          |

*Sample code:*

```sql
USE `kafka`;
SELECT 
  ISNOTNULL(modified_at) AS modified_at, 
  modified_at AS current_field 
FROM users-events
LIMIT 5;
```

*Output:*

```json
{
  "value": {
    "modified_at": false,
    "current_field": null
  }
}
{
  "value": {
    "modified_at": false,
    "current_field": null
  }
}
{
  "value": {
    "modified_at": true,
    "current_field": "2023-11-05T10:50:25.201315"
  }
}
{
  "value": {
    "modified_at": false,
    "current_field": null
  }
}
{
  "value": {
    "modified_at": false,
    "current_field": null
  }
}
```