具有相同值的行（不同列）

Question

SQL服务器串连的列值2005

我有返回

ID name prop value 
-------------------------- 
1 one  Prop1 a 
1 one  Prop1 b 
1 one  Prop2 c 
2 two  Prop1 d 
2 two  Prop2 e 

我如何运行选择一个表就可以返回

ID name prop  value 
----------------------------- 
1 one  Prop1  a,b 
1 one  Prop2  c 
2 two  Prop1  d 
2 two  Prop2  e 

Answer 1

试试这个：

--Concatenation with FOR XML and eleminating control/encoded character expansion "& < >" 
set nocount on; 
declare @YourTable table (RowID int, RowName varchar(5), prop varchar(5), RowValue varchar(5)) 

insert into @YourTable VALUES (1,'one','Prop1','a') 
insert into @YourTable VALUES (1,'one','Prop1','b') 
insert into @YourTable VALUES (1,'one','Prop2','c') 
insert into @YourTable VALUES (2,'two','Prop1','d') 
insert into @YourTable VALUES (2,'two','Prop2','e') 
set nocount off 

SELECT 
    t1.RowID,t1.RowName,t1.Prop 
     ,STUFF(
        (SELECT 
         ', ' + t2.RowValue 
         FROM @YourTable t2 
         WHERE t1.RowID=t2.RowID AND t1.RowName=t2.RowName AND t1.Prop=t2.Prop 
         ORDER BY t2.RowValue 
         FOR XML PATH(''), TYPE 
        ).value('.','varchar(max)') 
        ,1,2, '' 
      ) AS ChildValues 
    FROM @YourTable t1 
    GROUP BY t1.RowID,t1.RowName,t1.Prop 

OUTPUT：

RowID  RowName Prop ChildValues 
----------- ------- ----- ------------ 
1   one  Prop1 a, b 
1   one  Prop2 c 
2   two  Prop1 d 
2   two  Prop2 e 

(4 row(s) affected) 

Answer 2

SELECT T1.Name, T1.prop, T1.value+","+T2.value 
From Table T1 INNER JOIN Table T2 
ON T1.name = T2.name and T1.prop = T2.Prop and T1.value<>T2.value 

虽然这只适用于两个值。让我知道，我可以重写N值。

Answer 3

SELECT ID 
    ,name 
    ,prop 
    ,STUFF((SELECT ',' + value FROM table t2 WHERE t2.ID = t1.ID and t2.name = t1.name AND t2.prop = t1.prop FOR XML PATH('')),1,1,'') AS value 
FROM table t1 
GROUP BY ID,name,prop 

请参考： SQL Query to get aggregated result in comma seperators along with group by column in SQL Server