Re: Adding PRIMARY KEY: Table contains duplicated values

On 02/04/2013 06:45 AM, Alexander Farber wrote:
> Trying to delete the older of the duplicated pairs:
>
> # SELECT id, author, count(1), max(stamp) as maxx
> FROM pref_rep
> GROUP BY id, author
> HAVING count(1) >1 and stamp < maxx;
> ERROR: column "maxx" does not exist
> LINE 4: HAVING count(1) >1 and stamp < maxx;

How about:
SELECT id, author, count(1), max(stamp) as maxx
FROM pref_rep
GROUP BY id, author
HAVING count(1) >1 and stamp < max(stamp);

> ^
>
> On Mon, Feb 4, 2013 at 3:36 PM, Alexander Farber
> <alexander(dot)farber(at)gmail(dot)com> wrote:
>>>> http://stackoverflow.com/questions/14688523/adding-primary-key-table-contains-duplicated-values
>>
>
>

--
Adrian Klaver
adrian(dot)klaver(at)gmail(dot)com