Question

我正在尝试比较2个表，但似乎无法让它工作。这可能是非常基本的东西。这是我的代码：

Select bin, partno, count(*) from 
(SELECT parts.partno, location.bin
    FROM inventory
    INNER JOIN location
        ON inventory.locid = location.locid
    INNER JOIN parts
        ON inventory.partid = parts.partid
WHERE  loc = 'PnP'
UNION             
select partno, bin from dlyfeedercontents) t
Group By t.bin, t.partno
HAVING COUNT(*) = 1
ORDER BY bin

结果如下：

08-01   3052-93-7100-0C6    1
08-01   3052-93-7100-0C6    1
08-01   Test2               1
08-02   3052-90-7100-063    1
08-02   3052-90-7100-063    1

我似乎无法让Group或Count承认存在重复（例如，前两行）。 UNION的结果是我的预期。

Answer 1

我不太确定你要做什么，但我强烈怀疑问题是使用union而不是union all。 union删除重复项。这个版本是否符合您的要求？

select bin, partno, count(*) 
from ((SELECT parts.partno, location.bin
       FROM inventory INNER JOIN
            location
            ON inventory.locid = location.locid INNER JOIN
            parts
            ON inventory.partid = parts.partid
       WHERE loc = 'PnP'
      ) union all
      (select partno, bin
       from dlyfeedercontents
      )
     ) t
Group By t.bin, t.partno
HAVING COUNT(*) = 1
ORDER BY bin;

Answer 2

问题是某些数据（/ r）中的非打印字符！感谢所有帮助过的人！

试图比较2个表与多个联接

2 个答案: