April 2012
Intermediate to advanced
244 pages
6h 33m
English
Content preview from Microsoft® SQL Server® 2012 High-Performance T-SQL Using Window FunctionsBecome 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 1. SQL Windowing
Window functions are functions applied to sets of rows defined by a clause called OVER. They are used mainly for analytical purposes allowing you to calculate running totals, calculate moving averages, identify gaps and islands in your data, and perform many other computations. These functions are based on an amazingly profound concept in standard SQL (which is both an ISO and ANSI standard)—the concept of windowing. The idea behind this concept is to allow you to apply various calculations to a set, or window, of rows and return a single value. Window functions can help to solve a wide variety of querying tasks by helping you express set calculations more easily, intuitively, and efficiently than ever before.
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