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
Michael
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