Guidelines for Coding Noncorrelated Subqueries - 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™
To perform a subquery as an noncorrelated subquery and not as a correlated subquery, observe the following guidelines.
  • For each main and subquery you code, ensure that its scope is local by specifying a FROM clause that includes all the tables it references.
  • Instead of specifying join operations in the main queries of DELETE and UPDATE statements, restrict them to subqueries.