Dear Biomart users,

My situation is the following: I've 3 tables, the first one contains foreign
keys to the other two so in Biomart I've imported the 3 tables as three
different sources and I've created a config for the first table. Then I've
edited this config to import the other two sources and linking the three
tables by the corresponding foreign keys. After that, I've added the ensembl
mart as another source and tried to link with the previous three tables by
gene ensembl id that is a column of one of the above two tables that are
linked to the first one. The problem is that Biomart tells me that I need to
create a filter to the attribute that I want to use as linking point, then I
create it but the linkage is not working when I try to query the data. How
should I create that filter in order to do so?

I hope I manage to explain myself!

Thanks!

-- 
Isaac Cano
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