Suppliers(sid:integer, sname:string, city:string, street:string) Parts(pid:integer, pname:string, color:string) Catalog(sid:integer, pid:integer, cost:real)Consider the following relational query on the above database:
SELECT S.sname FROM Suppliers S WHERE S.sid NOT IN (SELECT C.sid FROM Catalog C WHERE C.pid NOT IN (SELECT P.pid FROM Parts P WHERE P.color<> \'blue\'))Assume that relations corresponding to the above schema are not empty. Which one of the following is the correct interpretation of the above query?
(A)
(B)
(C)
(D)
Answer
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