O'Reilly logo

Oracle® SQL by Example, Fourth Edition by Alice Rischert

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

Chapter 6. Aggregate Functions, GROUP BY, and HAVING Clauses

In the last two chapters, you learned about character functions, number functions, date functions, and miscellaneous functions—all single-row functions. In this chapter, you will learn about aggregate functions, which work on groups of rows. The most commonly used aggregate functions are discussed. Aggregate functions allow you to generate summary data for a group of rows to obtain totals, averages, counts, minimum values, and maximum values. In Chapter 17, “Exploring Data Warehousing Features,” you will learn about advanced SQL aggregation topics involving the ROLLUP ...

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