December 2012
Intermediate to advanced
752 pages
22h 12m
English
book
Training Kit (Exam 70-461): Querying Microsoft® SQL Server® 2012
by Dejan Sarka Itzik Ben-Gan and Ron Talmage
Content preview from Training Kit (Exam 70-461): Querying Microsoft® SQL Server® 2012Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Chapter 5. Grouping and Windowing
Exam objectives in this chapter:
Work with Data
Query data by using SELECT statements.
Implement sub-queries.
Implement aggregate queries.
This chapter focuses on data analysis operations. A data analysis function is a function applied to a set of rows, and it returns a single value. An example of such a function is the SUM aggregate function. A data analysis function can be either a group function or a window function. The two types differ in how you define the set of rows for the function to operate on. You can use grouped queries to define grouped tables, and then a group function is applied to each group. Or, you can use windowed queries that define windowed tables, and then a window function is applied to each ...
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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.