17.05 - Example: UPDATE With a Scalar Noncorrelated Subquery in its SET Clause - 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)

You can specify a scalar subquery in the same way that you specify a column or constant in the SET clause of an UPDATE request.

The following example specifies a scalar subquery in its SET clause:

     UPDATE sales_sum_table AS sst
     SET  total_sales = (SELECT SUM(amount)
                         FROM sales_table AS s
                         WHERE s.day_of_sale BETWEEN sst.period_start 
                                             AND     sst.period_end);