init research

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[//]: # (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.