January 2020
Beginner
256 pages
5h 11m
English
Content preview from Sams Teach Yourself SQL in 10 Minutes a Day, 5th Edition
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Lesson 16. Updating and Deleting Data
In this lesson, you will learn how to use the UPDATE and DELETE statements to enable you to further manipulate your table data.
Updating Data
To update (modify) data in a table, you use the UPDATE statement. UPDATE can be used in two ways:
To update specific rows in a table
To update all rows in a table
You’ll now take a look at each of these uses.
Caution: Don’t Omit the WHERE Clause
Special care must be exercised when using UPDATE because it is all too easy to mistakenly update every row in your table. ...
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