I've had a look over both yours and toolics' solutions, and decided to stick with yours, as I found dealing with the output of your version a lot easier - not too sure how to get the output from toolics' version into a nice pipe-delimited format. Had a poke around on Google and here, and couldn't find anything that my mind attached itself to as a reasonable solution.

So, after having a bit more of a play, this is what I've ended up with. Could you take a look, and see if you can see anything wrong with it, please?

#!/usr/bin/perl
use strict;
use warnings;

my %sum;

while (<DATA>) {
    chomp;
    
    my ($key, $value, $reason) = split(/\|/);

    if (! defined $reason || $value !~ /^\d+$/) {
        warn qq<dropped line: "$_"\n>;
        next;
    }

    $sum{$key}{value} += $value;
        if (! defined $sum{$key}{reason})
            {
            $sum{$key}{reason} = $reason;
            }
}

local $" = '/';
for my $key (keys %sum) {
    print "$key|$sum{$key}{value}|$sum{$key}{reason}\n";
}

__DATA__
USERID1|2215|Jones,Tom|
USERID1|1000|Jones, Tom|
USERID3|1495|Dole, Bob|
USERID2|2500|Francis, Pope|
USERID2|1500|Francis, Pope|
USERID4|0045|Doe, John|
USERID5|1225|Doe, Jane|
USERID4|4995|Doe, John|
USERID4|9995|Doe, John|
USERID6|1095|Darwin, Anita|
USERID7|1495|Dawson, Gary|
USERID6|1250|Darwin, Anita|

[download]
Prints: 
USERID5|1225|Doe, Jane
USERID3|1495|Dole, Bob
USERID7|1495|Dawson, Gary
USERID1|3215|Jones,Tom
USERID4|15035|Doe, John
USERID2|4000|Francis, Pope
USERID6|2345|Darwin, Anita

[download]

In reply to Re^4: Best way to store/sum multiple-field records? by bobdabuilda
in thread Best way to store/sum multiple-field records? by bobdabuilda

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