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General best practices for SQL Server triggers
From Wiki
In general the first thing you should check in a trigger is if there is anything to do, you can do this by using @@ROWCOUNT. If @@ROWCOUNT returns 0 then you should exit the trigger. Below is a little code example, I took the trigger definition from Books On Line and added the IF @@ROWCOUNT = 0 RETURN part
- CREATE TRIGGER NewPODetail2
- ON Purchasing.PurchaseOrderDetail
- AFTER INSERT AS
- IF @@ROWCOUNT = 0 --Nothing got affected
- RETURN --exit the trigger
- UPDATE PurchaseOrderHeader
- SET SubTotal = SubTotal +
- (SELECT SUM(LineTotal)
- FROM inserted
- WHERE PurchaseOrderHeader.PurchaseOrderID
- = inserted.PurchaseOrderID)
- WHERE PurchaseOrderHeader.PurchaseOrderID IN
- (SELECT PurchaseOrderID FROM inserted);
Part of SQL Server Programming Best Practices
Section Triggers
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