Re: Re[2]: [SQL] Query to eliminate duplicates

From: Leslie Mikesell <les(at)Mcs(dot)Net>
To: mjnf(at)uevora(dot)pt
Cc: sferac(at)bo(dot)nettuno(dot)it, pgsql-sql(at)postgreSQL(dot)org
Subject: Re: Re[2]: [SQL] Query to eliminate duplicates
Date: 1998-12-03 20:02:06
Message-ID: 199812032002.OAA26371@Mercury.mcs.net
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According to Mario Filipe:
>
> >>> MF> Is there a way to eliminate duplicate records using just SQL?
> >>>
> >>> SELECT DISTINCT ...
> >
> >
> > MF> The problem is that i have a table where there are duplicate
> > records
> > MF> and i want to delete them! I tryed creating a unique index but it told me
> > it
> > MF> couldn't because it didn't have a function to do something (I think it is
> > MF> because i had a boolean field in it)
>
> So a duplicate is actually a record that looks exactly like other record on the
> table...

How about:

select distinct * into newtable from oldtable ;
drop table oldtable;
alter table newtable rename to oldtable;

You have to drop/create indexes separately, even the ones built
implicitly from 'primary key' directives.

Les Mikesell
les(at)mcs(dot)com

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