Question

大家好，我是SQL的新手，我试图找到一种方法，在这种方式中，我只能获得在表的特定列中具有彼此不重复的值的行。 / p>

例如，下表名为T1，包含：

ID|Branch ID
1     444
2     333
3     444
4     111
5     555
6     333

我想要的结果将是

ID|Branch ID
4     111
5     555

所以只显示非重复的行

编辑：我想将其应用于大型关系代码。这是我想要添加的地方的片段

FROM dbo.LogicalLine
          INNER JOIN dbo.Page ON dbo.LogicalLine.page_id = dbo.Page.id
          INNER JOIN dbo.Branch ON dbo.LogicalLine.branch_id = dbo.Branch.id

表LogicalLine将有一个名为branch_id的列，其中包含重复的id值。我希望过滤出那些只显示非重复的branch_id的例子，如上面的例子，然后INNER将Branch表加入到我已经完成的LogicalLine中。

在此处添加了-Full代码：

SELECT  

(SELECT name
 FROM ParentDevice
 WHERE (Dev1.type NOT LIKE '%cable%') AND (id = Dev1.parent_device_id))T1_DeviceID,

(SELECT name
 FROM Symbol
 WHERE (id = CP1.symbol_id) AND (type NOT LIKE '%cable%'))T1_DeviceName,

(SELECT name
 FROM Location
 WHERE (id = Page.location_id))T1_Location,

(SELECT name
 FROM Installation
 WHERE (id = Page.installation_id))T1_Installation,

(SELECT name
 FROM ParentDevice
 WHERE (Dev2.type NOT LIKE '%cable%') AND (id = Dev2.parent_device_id))T2_DeviceID,

(SELECT name
 FROM Symbol
 WHERE ( id = CP2.symbol_id) AND (type NOT LIKE '%cable%'))T2_DeviceName,

(SELECT name
 FROM Location
 WHERE (id = PD2.location_id))T2_Location,

(SELECT name
 FROM Installation
 WHERE (id = Page.installation_id))T2_Installation,

(SELECT devicefamily
 FROM Device
 WHERE (type LIKE '%cable%') AND (id = SymCable.device_id))CablePartNumber,

(SELECT name
 FROM ParentDevice
 WHERE (id = DevCable.parent_device_id) AND (DevCable.type LIKE '%cable%'))CableTag

FROM dbo.LogicalLine
          INNER JOIN dbo.Page ON dbo.LogicalLine.page_id = dbo.Page.id
          INNER JOIN dbo.Branch ON dbo.LogicalLine.branch_id = dbo.Branch.id
          LEFT OUTER JOIN dbo.Symbol AS SymCable ON dbo.LogicalLine.cable_id = SymCable.id
          LEFT OUTER JOIN dbo.Device AS DevCable ON SymCable.device_id = DevCable.id
          LEFT OUTER JOIN dbo.ParentDevice AS ParentCable ON DevCable.parent_device_id = ParentCable.id
          INNER JOIN dbo.SymbolCP AS CP1 ON dbo.Branch.cp1_id = CP1.id
          INNER JOIN dbo.SymbolCP AS CP2 ON dbo.Branch.cp2_id = CP2.id
          INNER JOIN dbo.Symbol AS S1 ON CP1.symbol_id = S1.id
          INNER JOIN dbo.Symbol AS S2 ON CP2.symbol_id = S2.id
          INNER JOIN dbo.Device AS Dev1 ON S1.device_id = Dev1.id
          INNER JOIN dbo.Device AS Dev2 ON S2.device_id = Dev2.id
          INNER JOIN dbo.ParentDevice AS PD1 ON Dev1.parent_device_id = PD1.id
          INNER JOIN dbo.ParentDevice AS PD2 ON Dev2.parent_device_id = PD2.id
          INNER JOIN dbo.Location AS L1 ON PD1.location_id = L1.id 
          INNER JOIN dbo.Location AS L2 ON PD2.location_id = L2.id 
          INNER JOIN dbo.Installation AS I1 ON L1.installation_id = I1.id
          INNER JOIN dbo.Installation AS I2 ON L2.installation_id = I2.id

WHERE 
         (PD1.project_id = @Projectid)  AND (dbo.LogicalLine.drawingmode LIKE '%Single Line%');

Answer 1

Select Id, BranchId from table t
Where not exists
   (Select * from table
    where id != t.Id 
       and BranchId = t.BranchId)

或

 Select Id, BranchId
 From table
 Group By BranchId
 Having count(*) == 1

编辑：要按要求修改，只需在您的完整SQL查询中添加Where子句：

 Select l.Id BranchId, [plus whatever else you have in your select clause]
 FROM LogicalLine l
      join Page p ON p.id = l.page_Id 
      join Branch b ON b.Id = l.branch_id 
 Group By l.branch_id, [Plus whatever else you have in Select clause]
 Having count(*) == 1

或

Select l.Id BranchId, [plus whatever else you have in your select clause]
FROM LogicalLine l
      join Page p on p.id = l.page_Id 
      join Branch b on b.Id = l.branch_id 
Where not exists
   (Select * from LogicalLine 
    where id != l.Id 
       and branch_id = l.branch_id)

SQL过滤没有重复值的行

1 个答案: