Hi @fernandomendi 

In Delta Live Tables (DLT), if you want to assign a unique identifier to each row, enabling delta.enableRowTracking and selecting _metadata.row_id directly in your SQL query is a valid approach, just be sure to include it explicitly to avoid UNRESOLVED_COLUMN errors. As for identity columns, they aren’t supported for updates or merges and will return NULL when used in that context. They’re intended for use in streaming tables, so it's best to avoid updating them.