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Sergio Govoni

A place where share my experience on SQL Server and related technologies

Building Your T-SQL Tool Kit: Window Function Fundamentals

The session Building Your T-SQL Tool Kit: Window Function Fundamentals by Christina E. Leo (@christinaleo) has been published on channel SQLPASS TV.

Abstract

Have you pulled a script to identify duplicates from a blog post but couldn't quite get it to work because you weren't sure what that ROW_NUMBER() function was doing? Maybe you heard talk about creating running totals without using subqueries, but you got frustrated when the groups weren't totaling correctly. Or maybe, you've never even heard of window functions. All are good reasons to attend this all-demo session, which demystifies this versatile T-SQL tool. First, we'll break apart the OVER clause, the key to understanding how window functions work. Then we'll expand on each group of functions that can use the OVER clause: ranking, aggregate, and analytic functions. Finally, we'll look at real scenarios where this tool works and talk about performance considerations. When you leave, you'll have the fundamentals you need to fully develop your mastery of window functions.

Enjoy!

Published Tuesday, January 21, 2014 9:40 PM by Sergio Govoni

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