Question

SQL Server 2005

我有一张表返回

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

如何在其上运行选择以返回

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

输出：

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 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

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

Answer 3

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

这只适用于两个值。让我知道，我可以重写N值。

连接具有相同值（不同列）的行的列值

3 个答案: