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  my $sth_sel_hydro = $dbh->prepare(qq{
    SELECT hydro_id, discharge, precipitation  
...
    ORDER BY date_time 
    LIMIT 100 OFFSET ?
  });

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#! perl -slw
use strict;
...
C:\test>579883 -N=1e6
1 trial of Moving Std Dev: 100 of 1e6 items (372.109s total)