GROUP BY and Built-in Ordered Analytic Functions - Teradata Database

GROUP BY and Built-in Ordered Analytic Functions

For built‑in ordered analytic functions specific to Teradata Database, such as CSUM and MAVG, GROUP BY determines the partitions over which the function executes. For an example, see “Example 3: Specifying GROUP BY Using an Ordered Analytic Function” on page 134.

For window functions, such as SUM and AVG, GROUP BY collapses all rows with the same value for the group-by columns into a single row. The GROUP BY clause must include all the columns specified in the:

Select list of the SELECT clause

Window functions in the select list of a SELECT clause

Window functions in the search condition of a QUALIFY clause

The condition in a RESET WHEN clause

For examples and more information on GROUP BY and ordered analytical functions, see SQL Functions, Operators, Expressions, and Predicates.