Re: help w/ constructing a SELECT

Charles,

> > 3. All contigs where all clones have read = 'x'

SELECT * FROM contigs 
WHERE NOT EXISTS ( SELECT contig_idFROM clones WHERE clones.contig_id = contigs.contig_idAND read <> 'x');

i.e. "Select all contigs not having any clone whose read is something
other than 'x' "

got it?

-Josh Berkus