A GUIDE TO SQL
A GUIDE TO SQL
9th Edition
ISBN: 9781305897397
Author: Pratt
Publisher: CENGAGE L
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Chapter 8, Problem 20RQ

Explanation of Solution

Trigger:

  • The trigger is a named set of SQL statement that is executed at the time of data modification.
  • If the stated trigger condition meets up, then it means that the mentioned action in the trigger has been performed.

Three parts of trigger:

  • Event:
    • It specifies the changes to be made, such as an UPDATE or DELETE of a record.
  • Condition:
    • It specifies the condition to examine the records about to be affected...

Explanation of Solution

Purpose of triggers:

The purpose of triggers is given below:

  • For enforcement of business or security constraints.
  • Creation of duplication tables for backup purposes.
  • Used for auditing purpose.
  • In shopping scenario, it is used to offer free shipping for a client who orders an item which is more than $1000. A trigger will be built to check the order total upon the completion of the order...

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