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

my ($dbh, $rows);

$dbh = DBI->connect('dbi:mysql:test', 'root', '') ||
   die "Error opening database: $DBI::errstr\n";

$rows = $dbh->do("UPDATE checkin
        SET    destination =
        qq/SELECT destination
        FROM checkin
        WHERE firstname='Henry' AND lastname='Rollins'/
        WHERE  firstname='Bill' AND lastname='Gates'
") || die "Couldn't insert record : $DBI::errstr";

print "$rows row(s) added to checkin";
$dbh->disconnect || die "Failed to disconnect\n";