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Do You Know What Your Identity Is?

Do You Know What Your Identity Is?

Everyone by now is familiar with how to create auto increment keys in SQL Server–just define an integer column with identity (start,increment) and you are set. To create a new parent record and then insert a related record into a child table, you perform the insert into the parent, then execute a select @@identity to capture the auto increment number used by the system and carry over that number into the second insert into the child. But what happens if your system has a trigger on the parent table that inserts audit information whenever an insert happens into an audit log? If the audit table also has an auto increment key, the select @@identity will return the number used by the audit log, not the parent record.

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