| From: | Mezei Zoltán <mezei(dot)zoltan(at)telefor(dot)hu> |
|---|---|
| To: | Ezequias Rodrigues da Rocha <ezequias(dot)rocha(at)gmail(dot)com> |
| Cc: | pgsql-sql(at)postgresql(dot)org |
| Subject: | Re: Duplicate records |
| Date: | 2007-02-02 13:54:24 |
| Message-ID: | 45C34290.2090300@telefor.hu |
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| Thread: | |
| Lists: | pgsql-sql |
Ezequias Rodrigues da Rocha wrote:
> Hi list,
>
> I am making some data minning and would like to know if someone tell
> me how to retrieve the duplicate records based in one or two fields of
> my table.
>
> Any help would be welcomed.
You can use a simple query like this one:
select t1.id, t2.id
from table t1, table t2
where t1.record1 = t2.record1
and t1.record2 = t2.record2
and t1.id != t2.id
This one lists the ids of the matching records. You may need to fine
tune it to your needs, e.g. use distinct or replace the != with <.
Zizi
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