Question

当我进行减法时，我的查询出错了。我正在使用MS SQL。

SELECT PT.PcbId
  FROM dbo.DeviceTrace DT  
  JOIN dbo.PcbTrace  PT ON DT.CompId = '101125937' 
                       AND DT.DeviceID = PT.DeviceID

NOT IN (SELECT PB.PcbId
          FROM dbo.DeviceTrace DT 
          JOIN dbo.PcbTrace  PT ON DT.CompId = '101125937' 
                               AND DT.DeviceID = PT.DeviceID 
          JOIN dbo.PanelBlockTrace PB ON PB.PcbID = PT.PcbID)

你能纠正我吗？

Answer 1

我将您的查询重写为：

SELECT PT.PcbId
  FROM dbo.PcbTrace PT 
 WHERE EXISTS (SELECT NULL
                 FROM dbo.DeviceTrace DT 
                WHERE DT.DeviceID = PT.DeviceID 
                  AND DT.CompId = '101125937')
   AND NOT EXISTS (SELECT NULL
                     FROM dbo.PANELBLOCKTRACE pbt 
                    WHERE pbt.pcbid = PT.pcbid)

...因为您将第一次加入复制到NOT IN部分，但根据您提供的信息，PANELBLOCKTRACE和DEVICETRACE之间没有任何关系。

Answer 2

当您说'不在'时，您必须指定字段名称 - 如下所示：


select PT.PcbId
from dbo.DeviceTrace DT  INNER Join dbo.PcbTrace  PT 
on DT.CompId = '101125937' and DT.DeviceID = PT.DeviceID

and [fieldName] not in 

(select PB.PcbId
from dbo.DeviceTrace DT  INNER Join dbo.PcbTrace  PT 
on DT.CompId = '101125937' and DT.DeviceID = PT.DeviceID 
INNER Join dbo.PanelBlockTrace PB
on
PB.PcbID = PT.PcbID)

或者如果你想在一个单独的where子句中使用它，那么你需要：


select PT.PcbId
from dbo.DeviceTrace DT  INNER Join dbo.PcbTrace  PT 
on DT.CompId = '101125937' and DT.DeviceID = PT.DeviceID

where [fieldName] not in

(select PB.PcbId
from dbo.DeviceTrace DT  INNER Join dbo.PcbTrace  PT 
on DT.CompId = '101125937' and DT.DeviceID = PT.DeviceID 
INNER Join dbo.PanelBlockTrace PB
on
PB.PcbID = PT.PcbID)

虽然，你应该使用'左连接'而不是'不在'，这将更快..

Answer 3

从您的查询中可以看出，您希望排除PanelBlockTrace符合您的CompID过滤条件的那些PcbID。

试试这个：

select PT.PcbId
from dbo.DeviceTrace DT  
INNER Join dbo.PcbTrace  PT on DT.CompId = '101125937' 
                            and DT.DeviceID = PT.DeviceID
LEFT JOIN dbo.PanelBlockTrace PB ON PB.PcbID = PT.PcbID    
WHERE PB.PcbID IS NULL

我希望这个解决方案超过WHERE PT.PcbId NOT IN，因为它需要一个匹配表，而不是NOT IN需要的那个。

Answer 4

测试一下：

select PT.PcbId
from dbo.DeviceTrace DT  INNER Join dbo.PcbTrace  PT 
on DT.CompId = '101125937' and DT.DeviceID = PT.DeviceID
where PT.PcbId
not in 

(select PB.PcbId
from dbo.DeviceTrace DT  INNER Join dbo.PcbTrace  PT 
on DT.CompId = '101125937' and DT.DeviceID = PT.DeviceID 
INNER Join dbo.PanelBlockTrace PB
on
PB.PcbID = PT.PcbID)

Answer 5

使用EXCEPT而不是NOT IN，因为：

SELECT query1

EXCEPT

SELECT query2

Answer 6

你的查询似乎很好。

如果出现问题，请更具体。

此外，以下查询与您的相同：

SELECT PT.PcbId
FROM dbo.DeviceTrace DT  
  JOIN dbo.PcbTrace  PT ON DT.CompId = '101125937' 
                       AND DT.DeviceID = PT.DeviceID

EXCEPT

SELECT PcbId
FROM dbo.PanelBlockTrace

它具有更简单的结构，可以帮助您更轻松地发现问题。

如何在此查询中减号？

6 个答案: