Guidelines for Coding Noncorrelated Subqueries - Teradata Vantage

Teradata® VantageCloud Lake
Deployment
VantageCloud
Edition
Lake
Product
Teradata Vantage
Published
January 2023
ft:locale
en-US
ft:lastEdition
2024-12-11
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phg1621910019905
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, make sure its scope is local by specifying a FROM clause that includes all its referenced tables.
  • Instead of specifying join operations in the main queries of DELETE and UPDATE statements, restrict join operations to subqueries.