Richard, Thanks again.
> My bad, I didn't test it - for the last one you'll want > > SELECT contig_x_vw.contig_id FROM contig_x_vw ... > > It doesn't matter which id you use (since you want the value in each) but you > will need to tell PG which one you want. No problem, after I sent the email I caught the source of the ' "contig_id" is ambiguous' ERROR. > > It's checking the "contig_id"s are the same (from clone_contig) - .... A contig_id match is what I wanted, but also a requirement that clone.project,plate,col & row also match for cloneA and cloneB. I added what I think gives me the correct match params (see below) and a quick survey of the results looks to be ok. Is there a method to remove duplicate results? For instance the query below in part yields : chlamy_est-> ; contig_id ----------- 27170 27173 27173 27179 27179 27179 27179 27179 The repetitive occurrence of the same contig_id (27179) occurs as a result of multiple pairs of clones matching the criteria for a given contig_id. So for contig_id 27179 there are 5 pairs which match: cloneA cloneB contig_id 894018D05.x1 <-> 894018D05.y1 27179 894080H12.x1 <-> 894080H12.y1 27179 894094E04.x2 <-> 894094E04.y2 27179 894095H03.x1 <-> 894095H03.y2 27179 963037B05.x2 <-> 963037B05.y1 27179 CREATE VIEW contig_x_vw AS SELECT contig_id,project,plate,row,col FROM clone_contig, clone WHERE clone_contig.clone_id = clone.clone_id AND read='x'; CREATE VIEW contig_y_vw AS SELECT contig_id,project,plate,row,col FROM clone_contig, clone WHERE clone_contig.clone_id = clone.clone_id AND read='y'; SELECT contig_x_vw.contig_id FROM contig_x_vw, contig_y_vw WHERE contig_x_vw.project = contig_y_vw.project AND contig_x_vw.plate = contig_y_vw.plate AND contig_x_vw.col = contig_y_vw.col AND contig_x_vw.row = contig_y_vw.row AND contig_x_vw.contig_id = contig_y_vw.contig_id ; > > cloneA.project=cloneB.project > > cloneA.plate=cloneB.plate > > cloneA.row=cloneB.row > > cloneA.col=cloneB.col > > > > > > TABLE clone 'A' 'B' > > > > clone_id 12018 12019 > > project 894 894 > > plate 27 27 > > row G G > > col 9 9 > > read x y > > Does that get you any further? If not, I'm back at my desk tomorrow 9am GMT > > - Richard Huxton > > ---------------------------(end of broadcast)--------------------------- TIP 2: you can get off all lists at once with the unregister command (send "unregister YourEmailAddressHere" to [EMAIL PROTECTED])