Suppose I'm doing a group by query like the following: SELECT drug1, drug2, AVG(response) FROM data GROUP BY drug1, drug2 The problem is that the same drug may appear sometimes as drug1 and sometimes as drug2. So, for example, the combination "aspirin, acetaminophen" may also appear as "acetaminophen, aspirin" and I want these grouped together in the query. Is there a simple way to do this? --Aram Fingal -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
