September 2021
Beginner
624 pages
18h 4m
English
Content preview from SQL in 24 Hours, Sams Teach Yourself, 7th Edition
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Hour 17
Summarizing Data Results from a Query
What You’ll Learn in This Hour:
▶ Defining functions
▶ Using aggregate functions
▶ Summarizing data with aggregate functions
▶ Getting results from functions
▶ Understanding why you want to group data
▶ Grouping results with the GROUP BY clause
▶ Using group value functions
▶ Understanding group functions
▶ Grouping by columns
▶ Deciding between GROUP BY and ORDER BY
▶ Reducing groups with the HAVING clause
In this hour, you learn about the aggregate functions of SQL. You can perform a variety of useful functions with aggregate functions, such as getting the highest total of a sale or counting the number of orders processed on a given day. The real power of aggregate functions ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.