On 11/25/2011 08:49 AM, Rich Shepard wrote:
> On Fri, 25 Nov 2011, David Johnston wrote:
>
>> Simplistically you load all the data into a staging table that has no
>> natural primary key and then write a query that will result in only a
>> single record for whatever you define as a primary key. Insert the
>> results of that query into the final table.
>
> David,
>
> I was leaning toward doing this.
>
>> If you only use a subset of columns to uniquely determine the PK than you
>> need to decide how to resolve situations where the PK fields are
>> duplicated but the extra fields are unique. That step is why the first
>> description is simplistic.
>
> Well, that's point of a PK, isn't it? There should be only one row with
> that specific set of column values. The additional columns are unique to
> that set of PK values.
Gotta love an optimist:)
>
> Thanks,
>
> Rich
>
--
Adrian Klaver
adrian.klaver@gmail.com