Updating clause used in instead of trigger datingadvicehotline com
Replacing the Insert operator with a Delete might be even more confusing.
Perhaps the ideal would be a new graphical icon for an INSTEAD OF trigger worktable? The new Compute Scalar operator defines the type of action performed on each row.
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The answer is that SQL Server modifies the execution plan for the triggering DML statement when an INSTEAD OF trigger exists.
Rather than modifying the affected tables directly, the execution plan writes information about the changes to a hidden worktable.
The optimizer has chosen a one-to-many Merge Join instead of a Nested Loops Semi Join, which seems reasonable.
The renaming occurs when the XML show plan is generated from the internal execution plan representation, so there is no documented way to see the hidden worktable.The following script can be used to test the trigger with a larger number of rows.We will start with 1,000: The execution plan for the trigger body is now: Mentally replacing the (misleading) Clustered Index Seek with a Deleted Scan, the plan looks generally pretty good.Sentry One Newsletters The bi-weekly newsletter keeps you up to speed on the most recent blog posts and forum discussions in the SQL Server community.e News is a bi-monthly newsletter with fun information about Sentry One, tips to help improve your productivity, and much more.Summary: This article examines some surprising behaviour of INSTEAD OF triggers and reveals a serious cardinality estimation bug in SQL Server 2014.