O'Reilly logo

Sams Teach Yourself SQL™ in 10 Minutes, Third Edition by Ben Forta

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

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 the UPDATE statement is used. UPDATE can be used in two ways:

• To update specific rows in a table

• To update all rows in a table

Let's take a look at each of these uses.

image

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. Please read this entire section on UPDATE before using this statement.

UPDATE and Security Use of the ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required