RE: Uniqueness

If you are more interested in the ones that are not unique, I use

Select col_name,count(*)
>From table

Group by col_name
Having count(*) > 1

Kind regards,
Eric

-----Oorspronkelijk bericht-----
Van: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] Namens Chirag DBA
Verzonden: woensdag 18 mei 2005 8:31Aan: jacintakean_at_yahoo.com CC: oracle-l_at_freelists.org
Onderwerp: Re: Uniqueness

If it is a primary key, it will be unique... if not then you have to write an sql for finding duplicate values. If there are duplicate values it is not unique.

select col_name from table1 where rowid not in(Select min(rowid) from table1 group by col1,col2,col3,....);

Hope this will work.

Regards - Chirag=20

On 5/18/05, Kean Jacinta <jacintakean_at_yahoo.com> wrote:
> Hi again,
>=20
> Is there a way to check for uniqueness of a value ?
> Apart from set the column to be unique ?
>=20
> For example :
>=20
> Table : mytbl
> PK ID
> ----
> 1
> 2
> 3
>=20
> Insert into mytbl (id) values (2);
>=20
> Oracle will give error.
>=20
>=20
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