Dear BioMart users,

I'm dealing with BioMart to annotate a local database by importing several
attributes from the Ensembl mart (homo sapiens). Now I've created a
configuration for the Ensembl source and imported the local attributes to
it.

The general point is that we would like to retrieve all the data stored in
the local database plus other attributes from different sources like Ensembl
in case they exist, in case not we would like to still retrieve the local
data and getting "no data" in those Ensembl attributes that do not exist for
the selected local attributes. Is this possible?

The issue is that when I query only the local attributes (in this case the
"affy id" attribute) the results only contain those "affy ids" that are also
present on Ensembl. I would agree with this result if I would have included
in the query attributes from the Ensembl mart but this is not the case. Then
the question is the following: Is BioMart by default making the intersection
between the two sources when creating a link between them? Is there a way to
get the union instead of the intersection?

Thanks in advance,

-- 
Isaac Cano
Bioinformatics
Linkcare Health Services SL
C/Villarroel 170
08036 - Barcelona
Tel.: (+34)932 275 400, ext. 4182\4523
Mobile: (+34) 666 186 748
Fax: (+34) 932 275 455
[email protected]
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