Example: INSERT Using a Scalar Subquery - 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
dita:mapPath
pon1628111750298.ditamap
dita:ditavalPath
qkf1628213546010.ditaval
dita:id
esx1472246586715
lifecycle
latest
Product Category
Teradata Vantage™

A scalar subquery can be specified as a parameterized value in the value list of a simple INSERT request, but Vantage always interprets it as a noncorrelated scalar subquery.

For example, the database processes the scalar subquery SELECT d2 FROM t2 WHERE a2=t1.a1 in the select list of the following INSERT request as if it were SELECT d2 FROM t2, t1 WHERE a2=t1.a1.

In other words, the database interprets t1 in the scalar subquery as a distinct instance of t1 rather than as the target table t1 of the insert operation.

     INSERT INTO t1 VALUES (1,2,3 (SELECT d2
                                   FROM t2
                                   WHERE a2=t1.a1));