Jason A. Long (5/25/2015)

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If you're getting into windowed functions in SQL 2012, I'd encourage to to also included "Window Frames" in your study.

Windowed functions are an extremely powerful feature, and 2012's inclusion of widow frames only adds to that.

Also, if you haven'rt already picked up a copy, I don't think any attempt to learn Windowed Functions is complete without this... Microsoft SQL Server 2012 High-Performance T-SQL Using Window Functions (Developer Reference)