3rd Edition

ISBN: 9781305251038

Author: Joan Casteel

Publisher: Cengage Learning

Concept explainers

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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Textbook Question

Chapter 4, Problem 11MC

In the initial creation of a table, if a UNIQUE constraint is included for a composite column that requires the combination of entries in the specified columns to be unique, which of the following statements is correct?

a. The constraint can be created only with the ALTER TABLE command.
b. The constraint can be created only with the table-level approach.
c. The constraint can be created only with the column-level approach.
d. The constraint can be created only with the ALTER TABLE … MODIFY command.

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Chapter 4, Problem 10MC

Chapter 4, Problem 12MC

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Chapter 4 Solutions

Oracle 12c: SQL

Ch. 4 - What is the difference between a PRIMARY KEY...Ch. 4 - How can you verify the constraints that exist for...Ch. 4 - A table can have a maximum of how many PRIMARY KEY...Ch. 4 - Which type of constraint can be used to make...Ch. 4 - Which type of constraint should you use to ensure...Ch. 4 - How is adding a NOT NULL constraint to an existing...Ch. 4 - When must you define constraints at the table...Ch. 4 - Prob. 8RQ Ch. 4 - What is the difference between disabling a...Ch. 4 - Prob. 10RQ

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