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This sounds like double-talk, so I will explain a little more.
To learn whether and in what ways the columns of an inherently updatable view can be modified, query the USER_UPDATABLE_COLUMNS data dictionary view.The information displayed by this view is meaningful only for inherently updatable views.Inside the Trigger, I have added a condition that if record has Customer Id value 2 then such a record must not be deleted and an error must be raised. Net Question Answer site, specially started to allow visitors of this site ask their doubts and queries. Just click the Ask Now button and ask your question now.Also a record is inserted in the Customer Logs table. Now you can ask questions directly to me on my new site ASPForums. In the example shown here it simply counts the number of rows in the deleted table to see how many had a priority of high.
CREATE TRIGGER tr_Orders_DELETE ON Orders AFTER DELETE AS --Determine if Order with a Priority of High was deleted IF EXISTS (SELECT * FROM deleted WHERE Ord_Priority = 'High') BEGIN DECLARE @Count tinyint SET @Count = (SELECT * FROM deleted WHERE Ord_Priority = 'High') PRINT CAST(@Count as varchar(3)) ' row(s) where deleted whose priority was High' END go INSTEAD OF triggers are new to SQL Server 2000.
If you are not familiar with the inserted and deleted tables please read this article before continuing. Ord_Priority for orders with a priority of 'High.' The UPDATE trigger watches for orders whose priority are changed from something else to High.
CREATE TRIGGER tr_Orders_UPDATE ON Orders AFTER UPDATE AS --Make sure Priority was changed IF NOT UPDATE(Ord_Priority) RETURN --Determine if Priority was changed to high IF EXISTS (SELECT * FROM inserted a JOIN deleted b ON a. The IF statement checks to see if the Ord_Priority value was changed.
Either that, or it is a simple (but repeated) oversight.
Anyway, the way row-versioning works with AFTER triggers is quite intuitive.
Summary: This article examines some surprising behaviour of INSTEAD OF triggers and reveals a serious cardinality estimation bug in SQL Server 2014.