从两个表sql中选择字段

Question

我有以下查询来从数据库中选择记录。

目前一切正常。

select Barcode,systemqty from items where barcode in 
(select itibar from itrans group by itibar having sum(itiqty) <> systemqty) 
 and  brand='BRO'

现在，我需要像这样从 itrans 表中选择另一个字段

 select Barcode,systemqty,itibar from items where barcode in 
(select itibar from itrans group by itibar having sum(itiqty) <> systemqty) 
 and  brand='BRO'

以上代码导致错误。

Answer 1

作为示例中的 Barcode = itibar，您可以只包含条形码

select Barcode,
        systemqty, 
        barcode as itibar 
from items 
where barcode in 
(
select itibar 
from itrans 
group by itibar 
having sum(itiqty) <> systemqty

) 
and  brand='BRO'

或者，您可以将其更改为连接，以允许您在 select 语句中从 itrans 访问更多列：

select Barcode,
        systemqty, 
        itibarrows.itibar 
from items 
inner join (
    select itibar 
    from itrans 
    group by itibar 
    having sum(itiqty) <> systemqty
    ) itibarrows
    on itibarrows.itibar = items.barcode
where brand='BRO'