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Que. Given a Relation POSITION (Posting-No, Skill), then query to retrieve all distinct pairs of posting-nos requiring skill is
a. Select p.posting-No, p.posting-No from position p where p.skill = p.skill and p.posting-No < p.posting-No
b. Select p1.posting-No, p2.posting-No from position p1, position p2 where p1.skill = p2.skill
c. Select p1.posting-No, p2.posting-No from position p1, position p2 where p1.skill = p2.skill and p1.posting-No < p2.posting-No
d. Select p1.posting-No, p2.posting-No from position p1, position p2 where p1.skill = p2.skill and p1.posting-No = p2.posting.No
Answer:Select p1.posting-No, p2.posting-No from position p1, position p2 where p1.skill = p2.skill and p1.posting-No < p2.posting-No
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