A. The relation R(a,b) may have duplicate tuples. Which of the following queries has a result that is guaranteed not to have duplicates, regardless of what tuples R contains? a)SELECT a, AVG(b) FROM R GROUP BY a b)SELECT b FROM R WHERE a = b c)SELECT a FROM R WHERE a >= ALL (SELECT a FROM R) d)SELECT a FROM R WHERE a = 1 B. Relation R(a,b) has no duplicate tuples, although neither a nor b is a key. Relation S(c,d) may have duplicates. Which of the following queries is guaranteed to produce no duplicates? a)SELECT c, d FROM S WHERE c IN (SELECT a FROM R) AND d IN (SELECT b FROM R) b)SELECT S.c, S.d FROM R, S WHERE R.a = S.d AND R.b = S.c c)SELECT c FROM S WHERE c = d d)SELECT c, d FROM S GROUP BY c, d

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Programming with Microsoft Visual Basic 2017

8th Edition

ISBN:9781337102124

Author:Diane Zak

Publisher:Diane Zak

Chapter12: Database Queries With Sql

Section: Chapter Questions

Problem 1MQ2

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The relation R(a,b) may have duplicate tuples. Which of the following queries has a result that is guaranteed not to have duplicates, regardless of what tuples R contains?

		a)	SELECT a, AVG(b) FROM R GROUP BY a
		b)	SELECT b FROM R WHERE a = b
		c)	SELECT a FROM R WHERE a >= ALL (SELECT a FROM R)
		d)	SELECT a FROM R WHERE a = 1

Relation R(a,b) has no duplicate tuples, although neither a nor b is a key. Relation S(c,d) may have duplicates. Which of the following queries is guaranteed to produce no duplicates?

		a)	SELECT c, d FROM S WHERE c IN (SELECT a FROM R) AND d IN (SELECT b FROM R)
		b)	SELECT S.c, S.d FROM R, S WHERE R.a = S.d AND R.b = S.c
		c)	SELECT c FROM S WHERE c = d
		d)	SELECT c, d FROM S GROUP BY c, d

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