Re: group number

Hello

postgres=# select v, dense_rank() over(order by v) from
unnest('{a,a,b,c,c,c,d}'::varchar[]) g(v);
v | dense_rank
---+------------
a | 1
a | 1
b | 2
c | 3
c | 3
c | 3
d | 4
(7 rows)

Regards

Pavel

2014-05-09 22:15 GMT+02:00 Rene Romero Benavides <rene(dot)romero(dot)b(at)gmail(dot)com>:

> Thank you very much for your attention.
>
> I'm facing a mental block to achieve this in a performant manner:
>
> Input:
> a
> a
> b
> c
> c
> c
> d
>
> Desired output:
>
> a 1
> a 1
> b 2
> c 3
> c 3
> c 3
> d 4
>
>
> Any suggestions? Have a good day (night, afternoon or evening) and
> greetings from México City.
>
>