In a CREATE TABLE command address each of the following: (a) Explain what the NOT NULL specification for a column means and when you might apply this specification. (b) Explain what the UNIQUE specification for a column means and when you might want to apply this specification. (c) Explain what the DEFAULT specification means and when you might want to apply this specification.
In a CREATE TABLE command address each of the following: (a) Explain what the NOT NULL specification for a column means and when you might apply this specification. (b) Explain what the UNIQUE specification for a column means and when you might want to apply this specification. (c) Explain what the DEFAULT specification means and when you might want to apply this specification.
Database Systems: Design, Implementation, & Management
12th Edition
ISBN:9781305627482
Author:Carlos Coronel, Steven Morris
Publisher:Carlos Coronel, Steven Morris
Chapter7: Introduction To Structured Query Language (sql)
Section: Chapter Questions
Problem 13P: Write the two SQL command sequences required to: a.Create a temporary table named TEMP_1 whose...
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TCOs 4, 5) In a CREATE TABLE command address each of the following:
(a) Explain what the NOT NULL specification for a column means and when you might apply this specification.
(b) Explain what the UNIQUE specification for a column means and when you might want to apply this specification.
(c) Explain what the DEFAULT specification means and when you might want to apply this specification.
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Step 1
(a) Explain what the NOT NULL specification for a column means and when you might apply this specification.
Step 2
b) Explain what the UNIQUE specification for a column means and when you might want to apply this specification.
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