When to Use STRAIGHT_JOIN Over INNER JOIN in MySQL Queries
This article explains how STRAIGHT_JOIN differs from INNER JOIN in MySQL, why the optimizer’s automatic table order may not always be optimal, and how specifying STRAIGHT_JOIN lets you manually control the loading sequence of tables to improve query performance.
STRAIGHT_JOIN and INNER JOIN have exactly the same functionality.
When using INNER JOIN, MySQL automatically decides which table to load first based on its optimization rules.
However, the automatic choice is not always optimal, so manual control may be needed. STRAIGHT_JOIN is used in multi-table queries to specify the loading order of tables, allowing manual optimization of joins.
For example: table1 INNER JOIN table2 MySQL will decide which table to load first according to its own optimization rules.
If changed to: table1 STRAIGHT_JOIN table2 MySQL will directly load table1 first.
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