sql多行变一行

CREATE TABLE TempTable
(
    [TestCode] NVARCHAR(1000)
)
Insert TempTable values('a')
Insert TempTable values('b')
Insert TempTable values('c')
Insert TempTable values('d')

select stuff((SELECT ','+a.TestCode 
FROM(              
       SELECT * FROM TempTable
    ) a FOR xml path('')),1,1,'') 

例如多行数据：

a

b

c

d

变成多行：a,b,c,d

 

升级语法，合并分组后，多行变一列：

CREATE TABLE TempTable
(
    [TestCode] NVARCHAR(1000),
    [Name] NVARCHAR(1000)
)
Insert TempTable values('a','zhang')
Insert TempTable values('b','wang')
Insert TempTable values('c','li')
Insert TempTable values('a','zhao')

select * from TempTable

select [TestCode] as [TestCode], 
    LevelItem = (
        stuff((
            select ',' + Name from TempTable
            where [TestCode] = a.[TestCode] for xml path('')),1,1,'')
    )    
from TempTable a 
group by [TestCode]