1 delete与in搭配使用,效率特别低,如下可解决该问题,not in同理
/*正常写法*/ DELETE from activity where id in ( SELECT id from activity_data); /*优化后写法*/ DELETE from activity where id in (select * from (SELECT id from activity_data) t);
1 delete与in搭配使用,效率特别低,如下可解决该问题,not in同理
/*正常写法*/ DELETE from activity where id in ( SELECT id from activity_data); /*优化后写法*/ DELETE from activity where id in (select * from (SELECT id from activity_data) t);