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Copy Source | Copy HTML SET NOCOUNT ON SET TRANSACTION ISOLATION LEVEL SNAPSHOT DECLARE @SumVal int BEGIN TRANSACTION SELECT @SumVal = SUM(Value) FROM DevicesData WHERE DeviceId > 999000 WAITFOR DELAY '00:00:03' IF (@SumVal) = 0 INSERT INTO DevicesData (DeviceId, Value) VALUES (1000000, 111) COMMIT
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