Example: Scalar Subquery in the Select List of a SELECT Statement - Analytics Database - Teradata Vantage

SQL Data Manipulation Language

Deployment
VantageCloud
VantageCore
Edition
Enterprise
IntelliFlex
VMware
Product
Analytics Database
Teradata Vantage
Release Number
17.20
Published
June 2022
Language
English (United States)
Last Update
2024-04-05
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lifecycle
latest
Product Category
Teradata Vantage™

You can specify a scalar subquery as a column expression or parameterized value in the select list of a query. You can assign an alias to a scalar subquery defined in the select list, thus enabling the rest of the query to reference the subquery by that alias.

The following example specifies a scalar subquery (SELECT AVG(price)…) in its select list with an alias (avgprice) and then refers to it in the WHERE clause predicate (t2.price < avgprice).

     SELECT category, title,(SELECT AVG(price)
                             FROM movie_titles AS t1
                             WHERE t1.category=t2.category) AS avgprice
     FROM movie_titles AS t2
     WHERE t2.price < avgprice;

For additional examples of specifying scalar subqueries in SELECT statements, see: