1. Lead, LAG & CTE
Victor Ivantsov

2. About VICTOR IVANTSOV
Started with SQL Server 6.5 in 1996, still enjoy it
Now on SQL 2016 Standard, SSIS, SSRS, T-SQL
My Toastmaster club (Rivercity TM) meets every 7:15 AM
Enjoy running, soccer, music
(voice, text)

3. Agenda
Introduction: why I am addicted to cross/outer apply Deep dive #1: split string values into rows by delimiter Deep dive #2: support any user defined filter condition Adjournment, QnA

4. Big RecordsETS
@dir
@sort
@total
@limit
@start

5. @sort As Column Expression

6. ORDER BY CLAUSE

7. SPLIT LEFT and RIGHT Values
‘Jacksonville, FL 33296’
‘Smith Jr, Michael Peter’
‘coverageAmount ( 7,500’
‘UploadFile_usrid_12345.xls’
‘3)’

8. Ugly & Buggy code

9. Reuse existing code
Take existing function that split string values via XML
Add item # to the list
Escape special xml characters (&, <, > “)
Use new LEAD sql keword

10. Split values via xml - Preparation

11. SPLIT VALUES – XML Ready

12. Split Values – Function Ready

13. LEAD – usage example

14. Another complex function

15. Supported EXPRESSions
Is_match = New computed column

16. LEFT OUTER JOIN SAME COMPLEX FUNCTION?
SOLUTION #1
LEFT OUTER JOIN SAME COMPLEX FUNCTION?
TOO MUCH COMPLEXITY FOR QUERY OPTIMIZER

17. MULTI STATEMENT FUNCTION
SOLUTION #2
MULTI STATEMENT FUNCTION
STILL TOO SLOW

18. LaG & CTE *

19. Q & A
Victor Ivantsov (voice, text) Rivercity Toastmasters, club #892 meets every 7:15 AM IHOP 3250 Hodges Blvd, Jacksonville, FL 32224