Example: UPDATE With a Subquery in its WHERE Clause - Teradata Database - Teradata Vantage NewSQL Engine

SQL Data Manipulation Language

Product
Teradata Database
Teradata Vantage NewSQL Engine
Release Number
16.20
Published
March 2019
Language
English (United States)
Last Update
2019-05-03
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TD_DBS_16_20_Update1.ditaval
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B035-1146
lifecycle
previous
Product Category
Teradata Vantage™

The following examples perform the same UPDATE operation using either a subquery join with a derived table or a simple equality join on column_1 in table_1 and table_2.

     UPDATE table_1
     SET column_1 = 1
     WHERE column_1 IN (SELECT column_2
                        FROM table_2);

     UPDATE table_1
     SET column_1 = 1
     WHERE table_1.column_1=table_2.column_1;