需要数据

Question

我在这里的表中有数据

我正在尝试将其转换为这种格式/所需的输出

非常感谢您的帮助

Answer 1

这不是关系结构，因为行中的列实际上并不相互关联。因此，通常最好在应用程序级别完成这种类型的转换。

也就是说，您可以在Oracle中执行此操作。一种方法是条件聚合：

select col1,
       max(case when col3 = 'CAT1' then col2 end) as cat1,
       max(case when col3 = 'CAT2' then col2 end) as cat2
from (select t.*, row_number() over (partition by col1, col3 order by col2) as seqnum
      from t
     ) t
group by col1, seqnum
order by col1, seqnum;

Answer 2

您可以使用PIVOT：

select col1, cat1, cat2
from (
  select t.*, row_number() over (partition by col3 order by col2) as rn
  from t
)
pivot (min(col2) for (col3) in ('CAT1' as "CAT1", 'CAT2' as "CAT2"))
order by rn;

LiveSQL