> > > I read it that he has multiple sales from the same person? In which case > pretending that the two sales were from different people isn't the correct > result at all. Actually it turns out that both cases exist. > > I may be missing the point of the query, but wasn't it to add an entry for > each email address and (if it already exists in people) to update the > firstname field to match the firstname in the order? Yes. Basically the sales table is denormalized and I need to create or update normalized tables from it. As you have pointed out the difficult scenario is when the same person has multiple sales. > Given that the results will be returned in random order I would just change > the "nd" query to SELECT DISTINCT ON (email) , but like I said I may be > missing the point. I think in this case I am probably going to have go through the records one at a time. I run into the same issues with other columns such as products. -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
