2. DBI309: Using SQL Server 2012 Window Functions to Solve Common T-SQL Challenges Steven Wang MCITP – BI, Database Developer and DBA

3. Senior DBA Write Blogs @ MSBICOE.com Active Participant One of Top Answers Steven Wang

4. Agenda 2. ********** (Encrypted) 1. Solution Comparison 3.The Nitty- Gritties 5. Performance Comparison Demo

5. Note: The table is simplified for demo Purpose.

8. Note: The table is simplified for demo Purpose. A. 2000B. 2005C. 2008 D. 2012 E. Wrong Syntax

9. A. 2000B. 2005C. 2008 D. 2012 E. Wrong Syntax

10. A. 2000B. 2005C. 2008 D. 2012 E. Wrong Syntax

11. A. B.

13. --Quoted from PostgreSQL 8.4.12 Documentation --SQL Server 2012, BOL

14. SQL: 2008 SQL: 2003 SQL: 2011 SQL: 2006 ISO/ANSI Standard Window Functions introduced No Changes on Window Functions Window Functions Enhanced Extensive Coverage on Window Functions Over Clause (Limited) Rank Functions SQL Server 2005 No new Features for Window Functions SQL Server 2008 Extended support on Over Clause Distribution Functions Offset Functions SQL Server 2012 SQL Server VNext

16. Over()Over( ) Sum(Amount) Over( ) Partition By EmployeeID Order By Period Desc Rows Between Unbounded Preceding And 2 Following

18. Sum(Amount) Over( ) Partition By EmployeeID Order By Period Rows Between Unbounded Preceding And 2 Following Partition By Order by Frame 1 Frame 2 Frame 3 Frame 4 Frame 5 Frame 6

19. FromWhereGroup ByHavingSelectOrder By fwgh SO

20. Agg([All] Expression) Over(…) Agg(Exp) Over(…) Agg(All Exp) Over(…) Agg(Distinct Exp) Over(…) No Distinct Aggregations with Over() Note: Agg refers to all aggregation functions

21. fwgh SO No Distinct in aggregation with Over() A few more

22. A. 1 B. 2 1. 2. C. Both valid D. Both not

24. demo The T-SQL Challenge Solutions

25. Subquery Window Function

26. demo Performance Comparisons

27. Running Total Benchmark

28. SELECT Reverse( Concat(Col, Lead(Col,1) Over(Order by Col Desc) ) ) As Conclusion FROM ( Values ('!!lacirogamsatnahp'), (' era snoitcnuF wodniW') ) T(Col) ORDER BY Col Desc OFFSET 0 ROW FETCH FIRST 1 ROW ONLY;

31. DBI305: Practical Uses and Optimisation of New T-SQL Features in Microsoft SQL Server 2012 - Dave Dustin Exam 70-461: Querying Microsoft SQL Server 2012 Contact Me Later at Email: StevenWang@MSBICOE.comStevenWang@MSBICOE.com LinkedIn Search: Steven Wang Twitter: @MSBICOE Blog: www.MSBICOE.comwww.MSBICOE.com Required Slide *delete this box when your slide is finalised Speakers, please list the Breakout Sessions and Certification Exams that relate to your session. Make sure to indicate how delegates may contact you, if they have questions after the session.

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