Re: Comparison problem

2006-07-18 Thread Garaud Jean-Claude
On Thursday 13 July 2006 16:52, Peter Brawley wrote: > Jean-Claude > > >I agree that LEFT JOIN is probably part of the solution. But the command > > you suggest do not work, perhaps because several Chimeric_Cluster_IDs and > > Unigene_ID are void or NULL. I want a list of AC from > > Chimeric_Clus

Re: Comparison problem

2006-07-13 Thread Peter Brawley
Jean-Claude >I agree that LEFT JOIN is probably part of the solution. But the command you >suggest do not work, perhaps because several Chimeric_Cluster_IDs and >Unigene_ID are void or NULL. I want a list of AC from Chimeric_Cluster_IDs >that are not found in the gene_length table (Unigene_

Re: Comparison problem

2006-07-13 Thread Garaud Jean-Claude
On Thursday 13 July 2006 14:19, Peter Brawley wrote: > Jean-Claude > > >But how to list all AC in Chimeric_Cluster_IDs _ABSENT_ from the > > gene_length table, this one for instance : > >mysql> select Chr_Name, Unigene_ID from gene_length where > >Unigene_ID='Mm.371574'; > >Any idea ? > > That is c

Re: Comparison problem

2006-07-13 Thread Peter Brawley
Jean-Claude But how to list all AC in Chimeric_Cluster_IDs _ABSENT_ from the gene_length table, this one for instance : mysql> select Chr_Name, Unigene_ID from gene_length where Unigene_ID='Mm.371574'; Any idea ? That is called an exclusion join. To get at it, you need to adopt explicit joi