I know this question is more mysql related then PHP with mysql .. but

If I do a "SHOW INDEX from table_name"

I see what appears to be two index for the same column ?

table_name      0 PRIMARY       1       columnname      A       NULL    NULL    NULL
table_name      0 columnname    1       columnname      A       6623    NULL    NULL

Could the multiple index cause a problem ? I am trying to speed up a DB
query ?


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