Question

在表格中有2行，其中包含一个公共ID和不同的值。

前：

ID Response
=============
1  one
1  two
2  three
3  four

如何将这两行连成一列。

select  
   case 
      when multiple then row1 + ',' + row2 
      else Response 
   end as response
from testtable

预期产出：

response
==========
one,two    
three 
four

SQL专家：如何替换row1 + ',' + row2以使此查询有效？

Answer 1

Select Id, Stuff((Select ','+Response from TableName B where B.Id=A.Id for Xml Path('')),1,1,'') as Response from TableName A
group By Id;

Sql Fiddle Demo

Answer 2

Declare @t table(id int,col1 varchar(20))
insert into @t values(1,'one'),(1, 'two'),(2, 'three'),(3, 'four')
select distinct a.id,
stuff((select ','+col1 from @t b where b.id=a.id for xml path('')),1,1,'')col1
from @t a

如何在SQL中将这两行连接成一列

2 个答案: