Re: unique fields

Hi,

On 23 September 2010 07:30, Adrian Johnson <oriolebaltimore@gmail.com> wrote:
> I want to find out how many duplications are there for chr, cfrom and cto

Start with it http://www.postgresql.org/docs/9.0/interactive/tutorial-agg.html

p.s.

SELECT chr, cfrom, cto, count(*) FROM your_table GROUP BY 1, 2, 3;

>
> a.   c2,19,20 are common to samples 1,2 and 3.
>
> since there will be many instances like that, do I have to loop over
> entire rows and find common chr, cfrom and c2 and ouput with
> sample_id.
> how can I do that.
>
> thanks
> adrian
>
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