如何使用 T-SQL 透视表？

Posted 2023-03-29

【中文标题】如何使用 T-SQL 透视表？

【英文标题】：How to pivot table with T-SQL?

【发布时间】：2012-04-07 12:38:24

【问题描述】：

如何从这种格式转换表格：

Id | Data           |Section
------------------------------------------
1  |1AAA            |AAA
------------------------------------------
1  |1BBB            |BBB
------------------------------------------
1  |1CCC            |CCC
------------------------------------------
2  |2AAA            |AAA
------------------------------------------
2  |2BBB            |BBB
------------------------------------------
2  |2CCC            |CCC
------------------------------------------
3  |3AAA            |AAA
------------------------------------------
3  |3CCC            |CCC
------------------------------------------

用 T-sql 转成这种格式？

Id |Column_AAA|Column_BBB|Colunm_CCC|
-------------------------------------
1  |1AAA      |1BBB      |1CCC      |   
-------------------------------------
2  |2AAA      |2BBB      |2CCC      |       
-------------------------------------
3  |3AAA      |.....     |3CCC      |   

【参考方案1】：

这应该会给你想要的结果。

CREATE TABLE #temp
(
    id int,
    data varchar(50),
    section varchar(50)
)
insert into #temp values(1, '1AAA', 'AAA')
insert into #temp values(1, '1BBB', 'BBB')
insert into #temp values(1, '1CCC', 'CCC')
insert into #temp values(2, '2AAA', 'AAA')
insert into #temp values(2, '2BBB', 'BBB')
insert into #temp values(2, '2CCC', 'CCC')
insert into #temp values(3, '3AAA', 'AAA')
insert into #temp values(3, '3BBB', 'BBB')
insert into #temp values(3, '3CCC', 'CCC')

select id, [AAA] as Column_AAA, [BBB] as Column_BBB, [CCC] as Column_CCC
from 
(
    select id, data, section
    from #temp
) x
PIVOT
(
    max(data)
    FOR section IN([AAA], [BBB], [CCC])
) as p

drop table #temp

结果：

id  column_AAA column_BBB   column_CCC
1   1AAA        1BBB        1CCC
2   2AAA        2BBB        2CCC
3   3AAA        3BBB        3CCC