mysql - 没有子查询连接两个表

Question

我正在尝试创建没有子查询的 sql 查询，这里是工作查询:

select * from customers 
join 
(select idContactOwner, count(*) contacts_count 
from contacts GROUP BY idContactOwner HAVING contacts_count>5) k 
where customers.id=k.idContactOwner;

这是我正在尝试的方法，但它不起作用:

select idContactOwner, count(*) counter from contacts A
group by idContactOwner having counter>5 join customers B
on A.idContactOwner=B.id;

这是 sql fiddle :

http://sqlfiddle.com/#!2/724962/59

Answer 1

group by 必须在 join 之后

select A.idContactOwner, count(*) counter 
from contacts A
join customers B on A.idContactOwner = B.id
group by A.idContactOwner 
having counter > 5