Question

我有一个包含这些列的表：

Nameplate
Model
Segment

示例表如下所示：

Nameplate  Model  Segment
Acura      ILX    Small Lux Car
Audi       Q5     Compact Lux Car
Audi       Q5     Mid Lux Car
Audi       SQ5    Compact Lux Car

我需要找到多个Nameplate, Model的所有Segments组合。

在上表中，我需要它返回：

Audi       Q5     Compact Lux Car
Audi       Q5     Mid Lux Car

我认为以下内容可行：

SELECT DISTINCT 
   [Nameplate], [Model], [Segment]
FROM 
   dbo.[Weighted Extract]
GROUP BY 
   [Nameplate], [Model], [Segment]
HAVING 
   COUNT([Segment]) > 1;

以上代码仅返回包含多个Nameplate, Model和Segment行的组合。这应该比我做的容易，但是我被卡住了。

Answer 1

您可以使用EXISTS：

SELECT [Nameplate], [Model], [Segment]
FROM dbo.[Weighted_Extract] we1
WHERE EXISTS
(
    SELECT 1 FROM dbo.[Weighted_Extract] we2
    WHERE we1.Nameplate = we2.Nameplate
    AND   we1.Model = we2.Model
    AND   we1.Segment <> we2.Segment
);

Demo

Answer 2

试试这个，这应该来自sqlserver 2005 +：

;WITH X AS
(
  SELECT [Nameplate], [Model], [Segment], 
         count(*) over (partition by [Nameplate], [Model]) cnt
  FROM dbo.[Weighted Extract]
)
SELECT [Nameplate], 
       [Model], 
       [Segment] 
FROM X 
WHERE cnt > 1

Answer 3

试试这个：

SELECT [Nameplate], [Model]
FROM dbo.[Weighted Extract]
GROUP BY [Nameplate], [Model]
HAVING COUNT(distinct [Segment]) > 1;

SQL - 在一列中查找具有重复值的行

3 个答案: