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1. d) Find the sids of suppliers who supply some red part and some green part.

SELECT C.sid
FROM Parts P, Catalog C
WHERE P.color='red' and P.pid=C.pid
AND EXISTS (
SELECT P2.pid
FROM Parts P2, Catalog C2
WHERE P2.color = 'green' AND C2.sid =C.sid AND P2.pid = C2.pid)...

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