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This article will explain in detail how to compare the index query and analysis of mysql. The content of the article is of high quality, so the editor will share it with you for reference. I hope you will have some understanding of the relevant knowledge after reading this article.

Explainselect a.* from v_test_20190514_a a where not exists (select 1 from v_test_20190514_b b where a.path = b.path)

No query index has been established for the path field of tables an and b

The query index is established in the path field of table an and b

The amount of data: table a-2w; table b-20w

No indexed query takes time: long-minutes

Indexed query time: within 1 second

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