What is the difference between Qualify and Having - Teradata

Having can be used only when we can do a group-by clause
Whereas we can use Qualify without having to group anything


QUALIFY is a proprietary extension to filter the result of a Windowed Aggregate Function

A query is logically processed in a specific order:

1. FROM: create the basic result set
2. WHERE: remove rows from the previous result set
3. GROUP BY: apply aggregate functions on the previous result set
4. HAVING: remove rows from the previous result set
5. OVER: apply windowed aggregate functions on the previous result set
6. QUALIFY: remove rows from the previous result set

nVector

posted on 16 Jul 18