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> Reference material for INDEX_OF function

# INDEX_OF

Returns the index position of the first occurrence of the element in the array (or `NULL` if not found).

## Syntax

```sql theme={"theme":{"light":"css-variables","dark":"css-variables"}}
INDEX_OF(<array>, <value>)
```

## Parameters

| Parameter | Description                                      | Supported input types                                |
| :-------- | :----------------------------------------------- | :--------------------------------------------------- |
| `<array>` | The array to be analyzed                         | `ARRAY`                                              |
| `<value>` | The element from the array that is to be matched | Any type that corresponds to an element in the array |

## Return Type

`INTEGER`

## Example

The following example returns the index position of the 5 in the `levels` array:

<div className="query-window">
  ```
  SELECT INDEX_OF([1, 3, 4, 5, 7], 5) AS levels;
  ```

  | levels <span>int null</span> |
  | :--------------------------- |
  | 4                            |

  <p><span>Rows: 1</span><span>Execution time: 5.48ms</span></p>
</div>