Ordered Analytical Functions

Teradata Vantageā„¢ SQL Functions, Expressions, and Predicates

brand
Software
Teradata Vantage
prodname
Teradata Database
Teradata Vantage NewSQL Engine
vrm_release
16.20
category
Programming Reference
featnum
B035-1145-162K

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.