Mysql sql将列添加到结果
因此,我希望将itemlookupcode添加到查询结果中。itemlookupcode位于item表中,但查询针对不同的表。这两个表都有itemdescription,但当我进行联接或左联接时,会得到重复的项Mysql sql将列添加到结果,mysql,sql,sql-server,Mysql,Sql,Sql Server,因此,我希望将itemlookupcode添加到查询结果中。itemlookupcode位于item表中,但查询针对不同的表。这两个表都有itemdescription,但当我进行联接或左联接时,会得到重复的项 select * from [RAPurchaseOrderTransfer] where QtyDifference <> 0 and fromstoreid = 111 and DateCreated >= dateadd(dd, -30, GETDATE(
select *
from [RAPurchaseOrderTransfer]
where QtyDifference <> 0
and fromstoreid = 111
and DateCreated >= dateadd(dd, -30, GETDATE())
您知道如何将item.lookupcode添加到结果中吗?为了避免重复,您可以执行嵌套选择以获取itemlokupcode 使用MySQL时,limit 1将只返回1:
(select i.itemlookupcode from item i where i.itemdescription = r.itemdescription limit 1)
对于SQL Server,它将如下所示:
(select top 1 i.itemlookupcode from item i where i.itemdescription = r.itemdescription)
例如:
select
r.*,
(select top 1 i.itemlookupcode from item i where i.itemdescription = r.itemdescription)
from [RAPurchaseOrderTransfer] r
where r.QtyDifference <> 0
and r.fromstoreid = 111
and r.DateCreated >= dateadd(dd, -30, GETDATE())
另一个表的名称是什么?如果您有一对多关系,您将获得此表中记录的重复副本。