17.10 - Using SUM Instead of MDIFF - Advanced SQL Engine - Teradata Database

Teradata Vantageā„¢ - SQL Functions, Expressions, and Predicates

Product
Advanced SQL Engine
Teradata Database
Release Number
17.10
Published
July 2021
Language
English (United States)
Last Update
2021-07-28
dita:mapPath
SQL_Functions__Expressions__and_Predicates.Upload_071421/djk1612415574830.ditamap
dita:ditavalPath
SQL_Functions__Expressions__and_Predicates.Upload_071421/wrg1590696035526.ditaval
dita:id
kby1472250656485

The use of MDIFF is strongly discouraged. It is a Teradata extension to the ANSI SQL:2011 standard, and is retained only for backward compatibility with existing applications. MDIFF(x, w, y) is equivalent to:

   x - SUM(x) OVER (ORDER BY y 
                    ROWS BETWEEN w PRECEDING AND w PRECEDING)