Comments on: get Nth column of a table

by: Vit Spinka

Wed, 15 Aug 2007 16:39:01 +0000

Yes, it for example solves the classical problem: get month n from table with columns month01 to month12. The only difference is you don’t specify the column by position, but by name. (Which is definitely safer.)

by: Laurent Schneider

Wed, 15 Aug 2007 15:19:22 +0000

is it related to getting the nth column? I wrote about unpivot last year here

pivot table

by: Vit Spinka

Wed, 15 Aug 2007 14:21:24 +0000

And the ultimate solution - select value of the SAL column:
select empno, col, val
from emp
unpivot (val for col in (sal, comm))
where col=’SAL’;

(I had to choose sal and comm columns, as the unpivot clause needs identical datatype in processed columns).

Oh yes, 11g…