oracle 列转行

with temp as(

  select 'A01' nation ,1  as S1,2 as S2, 3 as S3 from dual union all

  select 'A02' nation ,null  as S1,5 as S2, 6 as S3 from dual

)

select * from temp

unpivot(Qty for Sizes in(s1,s2,s3))