Example: SELECT Statements With Scalar Subqueries in Expressions and as Arguments to Built-In Functions - 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 in the same way that you specify a column or constant in an expression or as an argument to a system function. You can specify an expression that is composed of a scalar subquery wherever an expression is allowed in a DML statement.

Following are examples of the types of expressions that you can code using scalar subqueries.

Arithmetic expressions

     SELECT (fix_cost + (SELECT SUM(part_cost)
                         FROM parts)) AS total_cost, …

String expressions

     SELECT (SELECT prod_name
             FROM prod_table AS p
             WHERE p.pno = s.pno) || store_no …

CASE expressions

     SELECT CASE WHEN (SELECT count(*)
                       FROM inventory
                       WHERE inventory.pno = orders.pno) > 0
                 THEN 1 
                 ELSE 0
            END, …

Aggregate expressions

     SELECT SUM(SELECT count(*)
                FROM sales
                WHERE sales.txn_no = receipts.txn_no), …

Value list expressions

     … WHERE txn_no IN (1,2, (SELECT MAX(txn_no)
                              FROM sales
                              WHERE sale_date = CURRENT_DATE));