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Sams Teach Yourself SQL by Arie D. Jones, Ron Plew, Ryan Stephens

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Chapter 9. Summarizing Data Results from a Query

In this hour, you learn about SQL’s aggregate functions. You can perform a variety of useful functions with aggregate functions.

The highlights of this hour include:

  • What functions are

  • How functions are used

  • When to use functions

  • Using aggregate functions

  • Summarizing data with aggregate functions

  • Results from using functions

What Are Aggregate Functions?

What Are Aggregate Functions?

Functions are keywords in SQL used to manipulate values within columns for output purposes. A function is a command normally used in conjunction with a column name or expression that processes the incoming data to produce a result. SQL contains several types ...

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