Mazzel Shu

icon company AIOT Orn Company icon location 11965 Venice Blvd, Los Angeles icon location I am Su Mazzel. I love learning and open source.I hope I can make my own contribution to github one day.

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UNION ALL clause query 41 tables

查询速度过慢，有什么办法提供查询速度吗？

UNION ALL clause query 41 tables

> 480条数据是这个查询结果集的还是全部表所有的？ 结果集