从两个sql表中选择字段

我使用以下查询从数据库中选择记录

目前它运转良好

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

现在，我需要从itrans表中选择另一个字段，如下所示

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

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上述代码会导致错误。

在您的示例中，由于Barcode=itibar，您可以只包含Barcode

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，您可以将其更改为联接，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'