I suggest trying to run this query interactively, but what I think is happening is that COUNT is a keyword, and that would cause a syntax error (which you don't check for...)

I'd probably re-write the query like this as I suspect the order by COUNT is what is failing.

SELECT count(*) as cnt
     , max(time) as MAX
     , min(time) as MIN
     , attacksignature 
  from np_data 
 where month=? and day=? 
 group by attacksignature 
 order by cnt desc
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Michael