17.00 - 17.05 - Ordered Analytical Functions - Advanced SQL Engine - Teradata Database

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

Product
Advanced SQL Engine
Teradata Database
Release Number
17.00
17.05
Published
June 2020
Language
English (United States)
Last Update
2021-01-30
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Ordered analytical functions provide support for many common operations in analytical processing and data mining that require an ordered set of results rows or depend on values in a previous row. Ordered analytical functions enable and expedite the processing of queries containing On Line Analytical Processing (OLAP) style decision support requests.

For example, computing a seven-day running sum requires:

  • First, that rows be ordered by date.
  • Then, that the value for the running sum be computed by:
    • Adding the current row value to the value of the sum from the previous row, and
    • Subtracting the value from the row eight days ago.