DATABASE SYSTEM CONCEPTS (LOOSELEAF)
DATABASE SYSTEM CONCEPTS (LOOSELEAF)
7th Edition
ISBN: 9781260515046
Author: SILBERSCHATZ
Publisher: MCG
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SQL
SQL stands for Structured Query Language, is a form of communication that uses queries structured in a specific format to store, manage & retrieve data from a relational database.
Queries
A query is a type of computer programming language that is used to retrieve data from a database. Databases are useful in a variety of ways. They enable the retrieval of records or parts of records, as well as the performance of various calculations prio…
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Chapter 6, Problem 28E

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 Difference between partial constraint: and total constraint:

 

Partial ConstraintTotal Constraint

In generalization or specialization hierarchy, some supertype occurrences are not members of a subtype.

In generalization or specialization hierarchy, every supertype occurrences must be member of more than one subtype.

It is symbolized by a circle over a one line...

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Chapter 6 Solutions

DATABASE SYSTEM CONCEPTS (LOOSELEAF)

Ch. 6 - Prob. 1PECh. 6 - Consider a database that includes the entity sets...Ch. 6 - Design an E-R diagram for keeping track of the...Ch. 6 - Prob. 4PECh. 6 - Prob. 5PECh. 6 - Prob. 6PECh. 6 - Prob. 7PECh. 6 - Consider a relation such as sec_course, generated...Ch. 6 - Suppose the advisor relationship set were...Ch. 6 - Prob. 10PE
Ch. 6 - Prob. 11PECh. 6 - Prob. 12PECh. 6 - Prob. 13PECh. 6 - Prob. 14ECh. 6 - Prob. 15ECh. 6 - Prob. 16ECh. 6 - Prob. 17ECh. 6 - Consider two entity sets A and B that both have...Ch. 6 - Prob. 19ECh. 6 - Prob. 20ECh. 6 - Prob. 21ECh. 6 - Prob. 22ECh. 6 - Prob. 23ECh. 6 - Design a database for an airline. The database...Ch. 6 - Prob. 25ECh. 6 - Design a generalization – specialization...Ch. 6 - Explain the distinction between disjoint and...Ch. 6 - Explain the distinction between total and partial...
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