Subquery Factoring (WITH) Clause
(Doc ID 1662498.1)
Last updated on JUNE 13, 2023
Applies to:
Oracle Database - Enterprise Edition - Version 9.0.1.0 and later Oracle Database Cloud Schema Service - Version N/A and later Oracle Database Exadata Cloud Machine - Version N/A and later Oracle Cloud Infrastructure - Database Service - Version N/A and later Oracle Database Backup Service - Version N/A and later Information in this document applies to any platform.
Purpose
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If similar subqueries appear more than once in a sql, it is worth trying to rewrite the query using WITH subquery. There are some things we should consider in order to get the benefit from it.
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