17.05 - Example: Subqueries Using the RANK Functions and QUALIFY Clauses - Advanced SQL Engine - Teradata Database

Teradata Vantage™ - SQL Data Manipulation Language

Product
Advanced SQL Engine
Teradata Database
Release Number
17.05
Release Date
January 2021
Content Type
Programming Reference
Publication ID
B035-1146-175K
Language
English (United States)

The following example uses nested RANK functions and QUALIFY clauses to report the top 100 items by profitability and the top items by revenue, matching those that appear in both lists using an OUTER JOIN:

     SELECT *
     FROM (SELECT item, profit, RANK(profit) AS profit_rank
           FROM item, sales
           QUALIFY profit_rank <= 100 AS p)
     FULL OUTER JOIN
          (SELECT item, revenue, RANK(revenue) AS revenue_rank
           FROM item, sales
           QUALIFY revenue_rank <= 100 AS r)
     ON p.item = r.item;

The results of this query might look something like the following table:

item

----

profit

------

profitrank

----------

item

----

revenue

-------

revenuerank

-----------

Dress slacks 17804 74 Dress slacks 180211 56
Dress shirts 16319 68 ? ? ?
Dresses 55888 82 Dresses 652312 77
Blouses 9849 48 Blouses 771849 92
? ? ? Skirts 817811 55