On 09/10/2008 17:36, Bill Thoen wrote: > I'm trying to combine two tables, but I only want unique records based > on the first two columns. Can UNION be used to join three-column tables > but only include records based on the uniqueness of the first two > columns? If not, how would I do this with PostgreSQL 8.1? How do you decide which records you want? - e.g. given the following rows... (a, b, c) (a, b, d) ...how do you decide whether you the one with c or the one with d? Ray. ------------------------------------------------------------------ Raymond O'Donnell, Director of Music, Galway Cathedral, Ireland rod@xxxxxx Galway Cathedral Recitals: http://www.galwaycathedral.org/recitals ------------------------------------------------------------------
