TAILIEUCHUNG - Aggregating Data Using Group Functions

After completing this lesson, you should be able to do the following: Identify the available group functions Describe the use of group functions Group data using the GROUP BY clause Include or exclude grouped rows by using the HAVING clause | Aggregating Data Using Group Functions Schedule: Timing Topic 35 minutes Lecture 40 minutes Practice 75 minutes Total Objectives After completing this lesson, you should be able to do the following: Identify the available group functions Describe the use of group functions Group data using the GROUP BY clause Include or exclude grouped rows by using the HAVING clause Lesson Aim This lesson further addresses functions. It focuses on obtaining summary information, such as averages, for groups of rows. It discusses how to group rows in a table into smaller sets and how to specify search criteria for groups of rows. What Are Group Functions? Group functions operate on sets of rows to give one result per group. EMPLOYEES The maximum salary in the EMPLOYEES table. Group Functions Unlike single-row functions, group functions operate on sets of rows to give one result per group. These sets may be the whole table or the table split into groups. Types of Group Functions AVG COUNT MAX MIN .

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