行列转换的SQL

原始表格Test_Table
[img]https://p-blog.youkuaiyun.com/images/p_blog_youkuaiyun.com/elivs_wu/EntryImages/20090210/Test_Table.jpg[/img]


第一次查询：

SELECT Material,
       (case when type='TA1' then num else 0 end) as TA1,
       (case when type='TA2' then num else 0 end) as TA2,
       (case when type='TA3' then num else 0 end) as TA3,
       (case when type='TA4' then num else 0 end) as TA4,
       (case when type='TB1' then num else 0 end) as TB1,
       (case when type='TB2' then num else 0 end) as TB2
from test_table

[img]https://p-blog.youkuaiyun.com/images/p_blog_youkuaiyun.com/elivs_wu/EntryImages/20090210/Result Of First Query.jpg[/img]


第二次查询：

SELECT Material,
       (case when type='TA1' then num else 0 end) as TA1,
       (case when type='TA2' then num else 0 end) as TA2,
       (case when type='TA3' then num else 0 end) as TA3,
       (case when type='TA4' then num else 0 end) as TA4,
       (case when type='TB1' then num else 0 end) as TB1,
       (case when type='TB2' then num else 0 end) as TB2
into #t
from test_table

select Material, sum(TA1) as TA1, sum(TA2) as TA2,sum(TA3) as TA3,
      sum(TA4) as TA4, sum(TB1) as TB1, sum(TB2) as TB2 
from #t
group by Material

[img]https://p-blog.youkuaiyun.com/images/p_blog_youkuaiyun.com/elivs_wu/EntryImages/20090210/Result Of Second Query.jpg[/img]