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Home > php教程 > php手册 > 实例讲解MySQL数据库的查询优化技术 （1）

实例讲解MySQL数据库的查询优化技术 （1）

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Release： 2016-06-13 10:06:29
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虽然在customer_num和order_num上建有索引，但是在上面的语句中优化器还是使用顺序存取路径扫描整个表。因为这个语句要检索的是分离的行的集合，所以应该改为如下语句：


（T114）
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mysql order superior optimization and exist Example technology database Inquire of index explain
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