如何将colums转换为sql中的行

Question

我有一个包含以下值的表

我需要输出值如下。

请帮助我们提供代码

Answer 1

它不漂亮，但这可行：

select *
from
(
select nams_contract_number, 1 as Sequence, 'Preqc' as DataType, act_preqc, est_preqc
from table
union all
select nams_contract_number, 2 as Sequence, 'abstractoin' as DataType, act_abstraction, est_abstraction
from table
union all
select nams_contract_number, 3 as Sequence, 'review' as DataType, act_review, est_review
from table
union all
select nams_contract_number, 4 as Sequence, 'postreview' as DataType, act_postreview, est_postreview
from table
) x
order by x.nams_contract_number, x.sequence