MySql使用总结_MySQL
MySql
内连接
当设计到id和parent_id在一张表中时，想要取得表的父类名称时往往涉及到内连接。及笛卡尔积，只有笛卡尔积加上ON时才有实际意义。
mysql执行顺序
写的顺序：select ... from... where.... group by... having... order by..
执行顺序：from... where...group by... having.... select ... order by...
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