use strict;
use warnings;
use Data::Dumper;

my %hash;

while (<DATA>) {
	chomp;
	my ( $url, $subject, $date ) = split /\t/;
	$hash{$url}->[0] //= $subject;
	push @{ $hash{$url}[1] }, $date;
}

local $" = ', ';
print "Url|Title|Date(s)|Count\n";
for my $key ( keys %hash ) {
	print "$key|$hash{$key}->[0]|@{ $hash{$key}[1] }|"
	  . scalar @{ $hash{$key}[1] } . "\n";
}

print "\n", Dumper \%hash;

__DATA__
http://www.perl.com	Perl	01/05/10 7:44PM
http://www.google.com/page?id=blah	Google Search results for blah	01/05/10 7:44PM
http://www.google.com/page?id=blah	Google Search results for blah	05/10/12 8:12AM
http://www.perl.com	Perl	01/05/10 7:42AM
http://www.perl.com	Perl	01/10/10 9:44PMM