Triggers in sql server

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Definition: Are special type of stored procedure that are defined to execute automatically, In place of or after data modification when Insert, Update, Delete triggering actions occurred on that table. 1) After Trigger Fired the triggering action. Executed automatically before the transaction is committed or rolled back. e.g. CREATE TRIGGER trgCheckStock ON [products] FOR UPDATE AS IF( Select inStockFrom inserted) < 0) BEGIN PRINT 'Can not oversell products' PRINT 'Transaction has been canceled' END GO 2) Instead Of Trigger Fire in place of the triggering action. Executed automatically before primary key and foreign key constraints are checked. e.g. CREATE TRIGGER trgCantDelete ON table1 INSTEAD OF DELETE AS PRINT 'you cannot delete this data' GO

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