[//]: # (title: single)

Returns the single [row](DataRow.md) that matches the given [condition](DataRow.md#row-conditions), or throws exception if there is no or more than one matching row.

## singleOrNull

Returns the single [row](DataRow.md) that matches the given [condition](DataRow.md#row-conditions), or `null` if there is no or more than one matching row.