Thank you for the principal.

I had to rewrite a little since I only wanted to affect the rows that
were using the max entry.

Adam

On Tue, Dec 18, 2012 at 12:58 PM, Igor Tandetnik <i...@tandetnik.org> wrote:
> On 12/18/2012 12:27 PM, Adam DeVita wrote:
>>
>> There is a table products where has a location id.  Unfortunately
>> duplicate dictionary names got added to list of locations
>>
>> products has    locationid and a bunch of other stuff
>>
>> I can easily get the max (bad) and min  (good)  location ids
>> associated with each name  (I know I should have made the name field
>> UNIQUE... mistakes were made years ago)
>>
>> how do I write an update that essentially says
>>
>> update products set locationid = good where locationid = bad  , but do
>> it for each good & bad pair ?
>
>
> update Products set locationid = (
>         select min(locationid) from Locations where name =
>         (select name from Locations L where L.locationid =
> Products.locationId)
> );
>
> --
> Igor Tandetnik
>
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