Not sure what you mean by:

I have a hashref, @records...

I thought (more knowlegeable monks will no doubt correct me if I'm wrong) that hashrefs were scalars, not arrays.

Anyway, if perchance you mean that you have this data in a file somewhere, you could do something like this (note that, to simplify, I use __DATA__ instead of opening the file and reading from the filehandle):

use strict;
use warnings;

my $headline = <DATA>;
my %HoA;
while ( <DATA> ) {
   s/null/0/g;
   # no warnings 'numeric';
   next unless /^\w/;
   chomp;
   my ( $name, @res ) = split /\s*\|\s*/;
   $HoA{$name} = ! $HoA{$name}
      ? [ @res ] 
      : [ map { $HoA{$name}[$_] + $res[$_] } 0 .. $#res ];
}

print $headline;
{
   local $" = ' | ';
   print "$_: @{ $HoA{$_} }\n" for ( keys %HoA );
}

__DATA__
name | passed | failed | pending
-----+--------+--------+---------
xxx | null | 2 | null
xxx | 30 | null | null
xxx | null | null | 10
yyy| 6 | null | null
[download]

The first line in the while() loop changes all your instances of 'null' to '0'. If you really don't want to do this, the easiest solution is probably to remove that line and uncomment the following line. There are other solutions, but I haven't really the time to find any that don't complicate the code significantly (hey, anyone else out there?...)

hth

dave

while ( $rec = $sth->fetchrow_hashref() ) {
 push @records, $rec;
}

@records now contains:

name | passed | failed | pending
------+--------+--------+---------
xxx | null | 2 | null
xxx | 30 | null | null
xxx | null | null | 10
yyy| 6 | null | null
[download]