SQL Server中的行列操作[关闭]

Question

我有一张这样的桌子：

我想从这个表中得到如下结果。我如何在 SQL Server 中做到这一点？

使用大小写时的输出

Answer 1

您可以使用条件聚合：

select max(case when col1 = 'a' then e end) as a_e,
       max(case when col1 = 'a' then f end) as a_f,
       max(case when col1 = 'a' then g end) as a_g,
       max(case when col1 = 'b' then e end) as b_e,
       max(case when col1 = 'b' then f end) as b_f,
       max(case when col1 = 'b' then g end) as b_g,
       max(case when col1 = 'c' then e end) as c_e,
       max(case when col1 = 'c' then f end) as c_f,
       max(case when col1 = 'c' then g end) as c_g,
       max(case when col1 = 'd' then e end) as d_e,
       max(case when col1 = 'd' then f end) as d_f,
       max(case when col1 = 'd' then g end) as d_g
from t;