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Fast and Furious: Discovering Windowing FunctionAhias [email protected], MCITP en Sql ServerDPA, SolidQ
Agenda
Introduction Aggregate Functions Ranking Functions Offset Functions Distribution Functions
Demo
Demo
Demo
Demo
Demo
Demo
What they can do WF?
What we DO?
We do things must not do
Window Functions
(Fabiano Amorim, Window Functions in Sql Server)
What can I do?
Paging De-duplicating data Returning top n rows
per group Computing running
totals
Identifying gaps and islands
Computing percentiles
Computing the mode of the distribution
You can imagine….
OVER
Aggregate Function
AVG CHECKSUM_AGG COUNT COUNT_BIG
MAX MIN SUM VAR VARP
DEMO
Ranking Functions
ROW_NUMBER RANK DENSE_RANK NTILE
DEMO
Offset Functions
LAG() LEAD() LAST_VALUE() FIRST_VALUE()
DEMO
Distribution Functions
CUME_DIST() PERCENT_RANK() PERCENTILE_CONT() PERCENTILE_DISC()
DEMO
Q & A
?
