Mysql 如何在SQL中拆分带条件的表并与其他表联接
我有两张桌子: 销售: 工作人员: 如何按AM/PM类型拆分Sales表并与Staff表联接 结果应该如下所示:Mysql 如何在SQL中拆分带条件的表并与其他表联接,mysql,sql,Mysql,Sql,我有两张桌子: 销售: 工作人员: 如何按AM/PM类型拆分Sales表并与Staff表联接 结果应该如下所示: 您可以使用不同的别名a和b两次加入表sales 例如: select s.id, s.name, a.value as am b.value as pm from staff s left join sales a on a.id = s.id and a.type = 'AM' left join sales b on b.id = s.id and b.typ
您可以使用不同的别名
a
和b
两次加入表sales
例如:
select
s.id,
s.name,
a.value as am
b.value as pm
from staff s
left join sales a on a.id = s.id and a.type = 'AM'
left join sales b on b.id = s.id and b.type = 'PM'
首先,需要使用union向上旋转此表,然后应用联接,如下所示-
谢谢
Select Name,A.ID,AM,PM From
(Select ID,Value as AM, ' ' from Sales where type='AM'
union
Select ID, ' ' , Value as PM from Sales where type='PM')A
Inner Join
(select ID, Name from Staff)B ON A.ID=b.ID