蹦迪
记一次MySQL多表联查时多个leftjoin优化
云蹦迪源码下载记⼀次MySQL多表联查时多个leftjoin优化从以前的30s左右到优化后的0.07s,速度嗖嗖的,原sql及具体优化如下:mysql面试题sql语句多表联查--⽅法⼀:SELECT s.id ,s.titleFROM school sLEFT JOIN area_school_link asl ON s.id = asl.school_idexecution riskLEFT J...
云蹦迪源码下载记⼀次MySQL多表联查时多个leftjoin优化从以前的30s左右到优化后的0.07s,速度嗖嗖的,原sql及具体优化如下:mysql面试题sql语句多表联查--⽅法⼀:SELECT s.id ,s.titleFROM school sLEFT JOIN area_school_link asl ON s.id = asl.school_idexecution riskLEFT J...