如何從mysql查詢中排除不常用的用戶名？

Question

我有這個代碼

SELECT usernames FROM table1

我想從table1選擇每個username ，但是我想排除在table2中出現少於5次的usernames 。

因此，我要這樣做：從table1中選擇所有用戶名，但不包括出現在table2中少於5行的用戶名。

我怎樣才能做到這一點？

Answer 1

select table1.username 
from table1 
inner join (select username, 
count(*) as count from table2 
group by username 
having count > 5) as tmp 
on table1.username = tmp.username

Answer 2

select username from table1 where username in
(
select username from (
select  username ,
count( * )
from table2 
group by username
having count( * ) > 5
) as x
);

在mysql 5.6上測試： 模式和代碼