July 2012
Intermediate to advanced
816 pages
27h 38m
English
Content preview from Programming Microsoft® SQL Server® 2012Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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The INSERT OVER DML Syntax
As you just saw, the MERGE statement supports the OUTPUT clause to access the INSERTED and DELETED pseudo-tables, as well as a special $action string value that returns ‘INSERT’, ‘UPDATE’, or ‘DELETE’ according to the action performed for each row processed by the merge operation.
The results generated by the OUTPUT clause can be captured in another table or table variable using OUTPUT…INTO, making it possible to easily maintain historical records of changes in the database. However, because using OUTPUT…INTO dumps every row captured by the clause into the destination table or table variable, it is not possible to filter on this data.
A Filterable Alternative to OUTPUT…INTO
INSERT OVER DML refers to a special syntax in ...
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