mysql 子查询与join性能比较

application_daily 11万条数据,application_info400多条数据

查询结果数据为19498

1. 子查询 (0.01s)

select sql_no_cache * from application_daily where application_info_id in (select id from application_info where Team_TeamID=3) 

2. 子查询 (0.002s)

select sql_no_cache * from application_daily where application_info_id in (161,162,163,164,165,166,167,168,169,170,171,172,173,174,175,176,177,178,179,180,181,182,183,184,185,186,187,188,189,190)

3.连接查询，两条语句等价(0.001s)

select sql_no_cache * from application_daily,application_info where Team_TeamID=3 and application_daily.application_info_id=application_info.id 

select sql_no_cache * from application_daily inner join application_info on (application_daily.application_info_id=application_info.id) where Team_TeamID=3

结论：坚决抛弃in