Oracle：按结果分组结果

Question

I'm having some issue with a specific select in Oracle :

Let's say we have a select returning those elements :

Person Evaluation Date         Hour

Bryan  A          10/12/2013   9:00

Ed     D          10/12/2013   9:00

Julia  A          10/12/2013   9:00

Will   F          10/12/2013   9:00

Bryan  B          10/12/2013   14:00

Ed     C          10/12/2013   14:00

Julia  A          10/12/2013   14:00

Will   C          10/12/2013   14:00

I want to be able, in my query, to increment a value for each occurence of a specific element, juste like :

Person Evaluation Date         Hour    Nb

Bryan  A          10/12/2013   9:00    1

Ed     D          10/12/2013   9:00    1

Julia  A          10/12/2013   9:00    1

Will   F          10/12/2013   9:00    1

Bryan  B          10/12/2013   14:00   2

Ed     C          10/12/2013   14:00   2

Julia  A          10/12/2013   14:00   2

Will   C          10/12/2013   14:00   2

I tried dense_rank() with an over(partition by xxx order by xxx), but I only got that :

Person Evaluation Date         Hour    Nb

Bryan  A          10/12/2013   9:00    1

Ed     D          10/12/2013   9:00    2

Julia  A          10/12/2013   9:00    3

Will   F          10/12/2013   9:00    4

Bryan  B          10/12/2013   14:00   1

Ed     C          10/12/2013   14:00   2

Julia  A          10/12/2013   14:00   3

Will   C          10/12/2013   14:00   4

Answer 1

Try removing the partition by clause:

dense_rank() over (order by xxx)

In your case, that would be:

dense_rank() over (order by "hour")