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[Source] sqlserver-trigger-determine which field was updated.

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Posted on 7/9/2018 5:05:47 PM | | | |
SQL script:




trigger statementsTwo special tables:d eleted and inserted tables.

The Deleted table is used to store copies of the rows affected by the DELETE and UPDATE statements. When you execute a DELETE or UPDATE statement, the row is removed from the trigger table and transferred to the deleted table. Deleted tables and trigger tables usually don't have the same rows.

The Inserted table is used to store copies of the rows affected by the INSERT and UPDATE statements. In an insert or update transaction, new rows are added to both the inserted and trigger tables. The rows in the Inserted table are copies of the new rows in the trigger table.

1. Insert operation
Inserted tables have data, deleted tables have no data

2. Delete
Inserted tables have no data, and deleted tables have data

3. Update
Inserted tables have data (new data), Deleted tables have data (old data)





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