Re: (un)grouping question

On Jan 21, 2008 1:45 PM, Scott Marlowe <scott(dot)marlowe(at)gmail(dot)com> wrote:
> On Jan 21, 2008 11:36 AM, Rhys Stewart <rhys(dot)stewart(at)gmail(dot)com> wrote:
> > Hi list,
> >
> > have the following table
> >
> > uid|somevalue
> > --------------------
> > 1|11
> > 2|44
> > 3|31
> > 4|44
> > 5|71
> > 6|33
> > 7|33
> > 8|44
> > 9|14
> >
> > would like to remove the duplicate values in the column somevalue. doing
> > this by just adding a random number is perfectly fine, however i want to
> > retain at least one of the original values of somevalue. Any ideas how to do
> > this in in a query?
>
> I can get you halfway there. You want a query something like this to
> identify all but one of the values:
>
> select a.uid from sometable a left join sometable b on
> (a.somevale=b.somevalue and a.uid > b.uid)
>
> From there, you'll have to figure out the update part of problem. :)

Oh yea, you might need a distinct in that select query.