"Harald Fuchs" <hf0114x@xxxxxxxxxxxxxx> writes: > If you want to select both columns, but have uniqueness over the first > only, you can use a derived table: > > SELECT tbl.name, tbl.comment > FROM tbl > JOIN (SELECT name FROM tbl GROUP BY name HAVING count(*) = 1) AS t > ON t.name = tbl.name > Or use the first() aggregate since you know there's only going to be one anyways: select name, first(comment) from tbl group by name having count(*) = 1 -- Gregory Stark EnterpriseDB http://www.enterprisedb.com Ask me about EnterpriseDB's PostGIS support! ---------------------------(end of broadcast)--------------------------- TIP 6: explain analyze is your friend
