SQL语句效率优化--持续更新
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);温馨提示: 本文由Jm博客推荐，转载请保留链接: https://www.jmwww.net/SQL/15861.html
