SQL
List Functions
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|   |   |
|:--|:--------|
| **Description** |Concatenate a list of lists into a single list. This only flattens one level of the list (see [examples](#::flattening)). |
| **Example** | `flatten([[1, 2], [3, 4]])` |
| **Result** | `[1, 2, 3, 4]` |