利用 SQL 语句如何实现多行数据转成多列？

[tohert]

[tohert]

[quote=引用 1 楼 二月十六 的回复:] 非常感谢老哥解惑！

[二月十六]

--测试数据
if not object_id(N'Tempdb..#主表') is null
	drop table #主表
Go
Create table #主表([id] int,[type] int,[title] nvarchar(25))
Insert #主表
select 1,1,N'表单1-1' union all
select 2,1,N'表单1-2' union all
select 3,2,N'表单2-1' union all
select 4,2,N'表单2-2'
GO
if not object_id(N'Tempdb..#扩展表') is null
	drop table #扩展表
Go
Create table #扩展表([id] int,[formid] int,[name] nvarchar(26),[title] nvarchar(23),[value] nvarchar(22))
Insert #扩展表
select 1,1,N'ext_a',N'工龄',N'18' union all
select 2,1,N'ext_b',N'职称',N'副级' union all
select 3,2,N'ext_1',N'工龄',N'18' union all
select 4,2,N'ext_b',N'职称',N'正级' union all
select 5,3,N'ext_2a',N'字段1',N'值1' union all
select 6,3,N'ext_2b',N'字段2',N'值2' union all
select 7,3,N'ext_2c',N'字段3',N'值3'union all
select 8,4,N'ext_2a',N'字段1',N'值1' union all
select 9,4,N'ext_2b',N'字段2',N'值2' union all
select 10,4,N'ext_2c',N'字段3',N'值3'
Go
--测试数据结束
DECLARE @sql VARCHAR(MAX)
SET @sql = 'select #主表.id,#主表.type,#主表.title'
SELECT  @sql = @sql + ',max(case name when ''' + name
        + ''' then [value] else null end)[' + name + ']'
FROM    ( Select DISTINCT name from #扩展表 JOIN #主表 ON  formid IN (SELECT id FROM #主表 WHERE type=2)
        ) a
SET @sql = @sql
    + ' from #扩展表 JOIN #主表 ON  formid =#主表.id  WHERE type=2 group by #主表.id,#主表.type,#主表.title'
EXEC(@sql)