O'Reilly logo

Amazon Redshift: A Columnar Database SQL and Architecture by David Cook, Tom Coffing

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

Chapter 13 - OLAP Functions

“Don’t count the days, make the days count.”

- Mohammed Ali

CSUM

image

This ANSI version of CSUM is SUM() Over. Right now, the syntax wants to see the sum of the Daily_Sales after it is first sorted by Sale_Date. Rows Unbounded Preceding makes this a CSUM. The ANSI Syntax seems difficult, but only at first.

CSUM – The Sort Explained

SELECT   Product_ID ‚ Sale_Date, Daily_Sales,

SUM(Daily_Sales) OVER (ORDER BY  Sale_Date

ROWS UNBOUNDED PRECEDING)    AS SUMOVER

FROM Sales_Table WHERE Product_ID BETWEEN 1000 and 2000 ;

image

The ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required