17.05 - Guidelines for Coding Noncorrelated Subqueries - 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)
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.