如何在内连接表上强制索引？

Question

如何在类似于此的查询上强制索引.我需要单独强制foo和bar上的索引.

SELECT foo.*, bar.*
FROM foo
INNER JOIN bar ON foo.rel_id = bar.rel_id
WHERE foo.status = 1
  AND bar.status = 1

Answer 1

假设索引一个存在于foo和索引b上栏:

SELECT foo.*, bar.*
FROM foo FORCE INDEX (a)
INNER JOIN bar FORCE INDEX (b) ON foo.rel_id = bar.rel_id
WHERE foo.status = 1
  AND bar.status = 1

会强制MySql上的索引选择