[Genome] unique key for table gwasCatalog

[Benson, Craig C]

Hi,

I was wondering, for the table "gwasCatalog" in the hg19 database, is there a 
unique key field(s) for each entry.  There are 7,096 rows, but some SNPs have 
more than one entry in the database, based on the disease association. I'm 
trying to join the tables "snp132Common" and "gwasCatalog" for only a subset of 
SNPs.

Thanks
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