Database System Concepts
Database System Concepts
7th Edition
ISBN: 9781260084504
Author: Abraham Silberschatz, S. Sudarshan, Abraham, Henry Korth, Silberschatz Abraham, Silberschatz Professor
Publisher: McGraw-Hill Education
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Intermediate SQL Concepts
A query is a request for data or information from one or more database tables. This information could be presented in the form of pictorials, graphs, or complicated findings which helps in easy interpretation. Structured Query Language (SQL) is the most …
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Chapter 4, Problem 4PE

  a.

Explanation of Solution

  Instances of a relation

  • The relation is

 r = (a, b) , s= (b1, c1) , t = (b, d)

  • In the result of the second expression...

  b.

Explanation of Solution

  Pattern with C null and D not null

  • It is not possible for D to be not null while C is null in the result of first expression, since in the subexpression s natural left outer join ...

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Chapter 4 Solutions

Database System Concepts

Ch. 4 - Prob. 1PECh. 4 - Prob. 2PECh. 4 - Prob. 3PECh. 4 - Prob. 4PECh. 4 - Prob. 5PECh. 4 - Prob. 6PECh. 4 - Prob. 7PECh. 4 - Prob. 8PECh. 4 - SQL allows a foreign-key dependency to refer to...Ch. 4 - Given the relations a(name, address, title) and...
Ch. 4 - Prob. 11PECh. 4 - Prob. 12PECh. 4 - Prob. 13PECh. 4 - Prob. 14ECh. 4 - Prob. 15ECh. 4 - Prob. 16ECh. 4 - Prob. 17ECh. 4 - Prob. 18ECh. 4 - Prob. 19ECh. 4 - Show how to define a view tot_credits (year,...Ch. 4 - Prob. 21ECh. 4 - Prob. 22ECh. 4 - Prob. 23ECh. 4 - Prob. 24ECh. 4 - Prob. 25ECh. 4 - Prob. 26E
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