Handling multiple rows in SQL Server trigger

Question

We have a database with a table called WarehouseItem where product\'s stock levels are kept. I need to know when ever this table get\'s updated, so I create

Answer 1

You use this:

-- Get Product Id
DECLARE @StockItemID INT = (SELECT ItemID FROM INSERTED);
DECLARE @WarehouseID INT = (SELECT WarehouseID FROM INSERTED);

But if you update multi rows (as your sample) you must use a different strategy.

For example, instead to declare a variable, use INSERTED table in JOIN in query where now you use your variable.

IF statement works on your variable but I think to move that condition in query.

Try to change you UPDATE query in this way (eventually add condition of IF):

-- Reset [StockUpdate] Queue Entry
UPDATE IC_StockUpdateQueue SET Synced = 0
FROM inserted 
WHERE inserted.itemID = StockItemID;

And so on.

For further information please add comment.