DATABASE SYSTEMS (LOOSELEAF)-W/MINDTAP
13th Edition
ISBN: 9781337761833
Author: Coronel
Publisher: CENGAGE L
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Chapter 7, Problem 24RQ
Program Plan Intro
UNION set operator:
The UNION set operator is used to combine the output of two or more than two queries and produce a result. The produced result contains unique values.
Syntax: QUERY UNION QUERY;
EXCEPT/ MINUS set operator:
The MINUS set operator is used to combine the output of two or more than two queries and produce a result. The produced result contains the values (rows) that appear in the first table but not in the second table. The word “EXCEPT” can also be used in the place of “MINUS”.
Syntax: QUERY MINUS QUERY;
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Chapter 7 Solutions
DATABASE SYSTEMS (LOOSELEAF)-W/MINDTAP
Ch. 7 - Prob. 1RQCh. 7 - Explain why the following command would create an...Ch. 7 - What is a cross join? Give an example of its...Ch. 7 - What three join types are included in the outer...Ch. 7 - Using tables named T1 and T2, write a query...Ch. 7 - Prob. 6RQCh. 7 - Rewrite the following WHERE clause without the use...Ch. 7 - Explain the difference between an ORDER BY clause...Ch. 7 - Explain why the following two commands produce...Ch. 7 - What is the difference between the COUNT aggregate...
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