Fast and Furious: Discovering Windowing Function

Fast and Furious: Discovering Windowing FunctionAhias PortilloPortillo.ahias@Outlook.comMVP, 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

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