判断表中是否存在该记录

DECLARE @ROW NUMERIC(10)
DECLARE @CARTID CHAR(36)
DECLARE @PRODUCTID INT
SET @CartID = '535768cb-2e52-4f6e-ab03-c03d73b0a6c1'
SET @PRODUCTID =33

SELECT @ROW = COUNT(*) FROM PShoppingCart
WHERE CartID = @CartID AND ProductID = @ProductID

--PRINT @ROW

IF @ROW <> 1
BEGIN

.......

ELSE