SQL
Scalar Utility Functions
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|   |   |
|:--|:--------|
| **Description** |Return the first expression that evaluates to a non-`NULL` value. Accepts 1 or more parameters. Each expression can be a column, literal value, function result, or many others. |
| **Example** | `coalesce(NULL, NULL, 'default_string')` |
| **Result** | `default_string` |