[英]DB2 SQL count in join or where clause
This is probably an amateur question but I'm an amateur ! 这可能是一个业余问题,但我是业余爱好者! ;o)
; o)
I have several tables: Account table, Officer table, Location table, Web table... The Officer table doesn't give me the number of officers per account. 我有几个表:帐户表,官员表,位置表,Web表...官员表没有给我每个帐户的官员人数。
I need to retrieve only the accounts that have more than 20 officers. 我只需要检索拥有20多名职员的帐户。 Should I use the COUNT ?
我应该使用COUNT吗? If so, how ?
如果是这样,怎么办?
Your help is greatly appreciated. 非常感谢您的帮助。 Thanks.
谢谢。
Pat 拍
Update: 更新:
select a.id, a.eff-date, l.address, l.city, c.phonenumber
from Account a
left outer join location l on a.id = l.id
left outer join contact c on a.id = c.id
where a.id in (
select a.id
from Account a
inner join Officer ao on a.id = ao.id
group by a.id
having count(*) > 20
)
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