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My kindergarten SQL Server taught me that a trigger may be fired with multiple rows in the inserted and deleted pseudo tables. I mostly write my trigger code with this in mind, often resulting in some cursor based cludge. Now I’m really only able to test them firing for a single row at a time. How can I generate a multirow trigger and will SQL Server actually ever send a multirow trigger? Can I set a flag so that SQL Server will only fire single row triggers??
Yes, if a statement affects more than one row, it should be handled by a single trigger call, as you might want to revert the whole transaction. It is not possible to split it to separate trigger calls logically and I don’t think SQL Server provides such a flag. You can make SQL Server call your trigger with multiple rows by issuing an UPDATE or DELETE statement that affects multiple rows.