QUALIFY Clause - Teradata Database

Purpose

A conditional clause in the SELECT statement that filters results of a previously computed ordered analytical function according to user-specified search conditions.

Syntax

Syntax Elements

QUALIFY

An introduction to a conditional clause that, similar to HAVING, further filters rows from a WHERE clause. The major difference between QUALIFY and HAVING is that with QUALIFY the filtering is based on the result of performing various ordered analytical functions on the data.

search_condition

One or more conditional expressions that must be satisfied by the result rows.

You can specify ordered analytical functions and scalar subqueries as search conditions with QUALIFY.

You can use aggregate operators and DEFAULT functions within a QUALIFY search condition.

The QUALIFY condition cannot reference LOB columns.

If you specify the value for a row-level security constraint in a search condition, that value must be expressed in its encoded form.

ANSI Compliance

The QUALIFY clause is a Teradata extension to the ANSI standard.

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