Hi all. With DBI and Oracle I'm working with a database with the following entries (cat1..cat15 are categories): 
    report_no,
    reported_by
    project_no
    date_reported
    cat1
    cat2
    cat3
    cat4
    cat5
    cat6
    cat7
    cat8
    cat9
    cat10
    cat11
    cat12
    cat13
    cat14
    cat15

[download]
and for categories cat1..cat15, I'd like to get an average for each row AND an average for each column. I'm having problems trying to work out how to get the latter. Here is what I have so far: 
use strict;

$sth = $dbh->prepare(qq{

  SELECT 
    report_no,
    reported_by,
    project_no,
    to_char(date_reported,'DD-MON-YYYY'),
    cat1
    .
    .
    .
    cat15
      FROM TABLE
               ORDER BY report_no DESC
          
      });


$sth->execute();
$array_ref = $sth->fetchall_arrayref();

$i = 0;

foreach $row (@$array_ref) {
  
  ($report_no,$reported_by,$project_no,$date_reported) 
   = @$row[0..3];

  #Categories in each row may have undef elements, replace
  #with a '-'. For defined values, sum them up. This sum is
  #used to calculate the average for each row.
  
  $number = 0;
  $sum = 0;
  foreach $element (@$row[4..18]) {
    if ($element == -1) { $element = '-' }
    else { 
      $element = sprintf "%.2f", $element;
      $sum += $element;
      ++$number;
    }
  }
  
  $row_avge = sprintf "%.2f", $sum / $number;
  
  $i++;
}

$sth->finish();
$dbh->disconnect;

[download]
Can anyone help me with getting averages for each column? I'm all hashed out...
Many thanks in advance.
Stacy.

In reply to DBI and fetchall_arrayref (gosh!) by maderman

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