Re: Removing duplicate keys and updating deleted entry key in other table

> I have a table that has 19 duplicte entries:
> table - sequence:
> seq_id | seq_refseq | seq_gname
> --------+--------------+-----------------
> 33014 | NM_025196 | GRPEL1
> 33015 | NM_007186 | CEP2
> 33016 | NM_018148 | LINS1
> 33017 | NM_199166 | ALAS1
> .....
> I suspected there are some duplicate entries:
> >select seq_refseq,count(*) as score from sequence
> group by seq_refseq having count(*) > 1;
> seq_refseq | score
> --------------+-------
> NM_033421 | 2
> NM_018290 | 2
> .....................
> NM_005311 | 2
> (19 rows)
> > select * from sequence where
> seq_refseq ='NM_033421';
> seq_id | seq_refseq | seq_gname
> --------+------------+-----------
> 43535 | NM_033421 | C20orf161
> 43554 | NM_033421 | C20orf161
> (2 rows)
> Now that 19 records are duplicated, I want to delete
> the duplicated records from other table comb:
> Table comb:
> >select * from comb;
> cid | gid | seq_id
> --------+-------+--------
> 85830 | 5116 | 33014
> 85831 | 22191 | 33014
> 85832 | 22186 | 33014
> .......................
> for some i checked to see if any records holds the
> duplicated key. i found none for 3 or 4 cases.
> select * from comb where comb.seq_id = 43539;
> cid | gid | seq_id
> -----+-----+--------
> (0 rows)
> my question is how do I delete the duplicate row and
> make sure I update the comb table after I delete the
> duplicate key.
> I never did this before and is a complex problem for
> me to code.

I tried to come up with the sql on my own, but then I remembered a similar email that already had
a good answer.
http://archives.postgresql.org/pgsql-novice/2006-06/msg00092.php

Regards,

Richard Broersma Jr.