A Guide to SQL
9th Edition
ISBN: 9781111527273
Author: Philip J. Pratt
Publisher: Course Technology Ptr
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Chapter 8, Problem 18RQ
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Processing a collection of rows retrieved by “SELECT” command in Access:
Recordset is used to process a collection of rows retrieved by a “SELECT” command in Access.
- First the SQL command is to be created in a string variab...
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The Developers team also wants you to ensure that emails are converted to lowercase
after an update operation. Currently, new insertions are guaranteed to have lowercase
emails, but there is no such guarantee for legacy emails. Therefore, the team wants to
ensure that emails are being retained in a lowercase irrespective of any changes in the
database. Create a new TRIGGER called email_update for the USERS table that runs
before an UPDATE operation.
Task
Create a TRIGGER to run on the USERS table before any UPDATE operation.
Task 5:
The Developers team also wants you to ensure that emails are converted to lowercase after an update operation. Currently, new insertions are guaranteed to have lowercase emails, but there is no such guarantee for legacy emails. Therefore, the team wants to ensure that emails are being retained in a lowercase irrespective of any changes in the database. Create a new TRIGGER called email_update for the USERS table that runs before an UPDATE operation.
Which of the following statements is correct? (refer to the tables in the JustLee Books database) a. A table can contain a maximum of only one column marked as unused. b. You can delete a table by removing all columns in the table. c. Using the SET UNUSED clause allows you to free up storage space used by a column. d. None of the above statements are correct.
Chapter 8 Solutions
A Guide to SQL
Ch. 8 - Prob. 1RQCh. 8 - Prob. 2RQCh. 8 - Prob. 3RQCh. 8 - Prob. 4RQCh. 8 - Prob. 5RQCh. 8 - Prob. 6RQCh. 8 - Prob. 7RQCh. 8 - Prob. 8RQCh. 8 - Prob. 9RQCh. 8 - In PL/SQL, how do you assign variables the same...
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