Question

Consider the following Dig, Assume that all the three tables have a column Is_Deleted by default it is set to 0… I want to update Is_Deleted=1 field of Customers table where CustId=2 only when the rows containing CustId=2 and Is_Deleted=1 in Orders and OrderItems
Tables… I dont want to use Cascade option.. Any suggestion

_{(source: microsoft.com)}

Answer 1

Easiest way is EXISTS. I assume you want to check both Orders and OrderItems. This also means you only filter on CustID once.

UPDATE
   C
SET
   IsDeleted = 1
FROM
   Customers C
WHERE
   C.CustID = 2
   AND
   EXISTS (SELECT *
        FROM
            Orders O
        WHERE
            O.CustID = C.CustID AND O.IsDeleted = 1)
   AND
   EXISTS (SELECT *
        FROM
            Orders O
            JOIN
            OrderItems OI ON O.OrderID = OI.OrderID
        WHERE
            O.CustID = C.CustID AND OI.IsDeleted = 1)