A Guide to SQL
A Guide to SQL
9th Edition
ISBN: 9781111527273
Author: Philip J. Pratt
Publisher: Course Technology Ptr
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Chapter 6, Problem 12SCG
Program Plan Intro

Primary key:

  • To identify each record in a table, at least there must be one data field, which should be unique.
    • That is corresponding data field of every record should be unique.
    • It is called primary key.
  • Primary key is used to identify the unique record from a collection of records.

“INTEGER” datatype:

  • The numeric values with an implied scale of zero is accepted by the “INTEGER” datatype.
  • It will store integer value between the range 2^-31 and 2^31-1.

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