error calling MySQL from Perl

[mooseboy]

Fellow monks,

Having decided I need to learn something about Perl's database capabilities, I was just re-reading chapter 13 of Simon Cozens' Beginning Perl (the only book I have that touches on the subject) and have gotten most of the code examples to work, but there's one script that keeps giving me a MySQL error that I just can't figure out. Here it is:

#!/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";

The error I get is as follows:

DBD::mysql::db do failed: You have an error in your SQL syntax near 'S
+ELECT destination
        FROM checkin
        WHERE firstname='Henry' AND last' at line 3 at ./broken line 1
+1.
Couldn't insert record : You have an error in your SQL syntax near 'SE
+LECT destination
        FROM checkin
        WHERE firstname='Henry' AND last' at line 3 at ./broken line 1
+1.

I've spent ages ploughing through the MySQL docs, but as these are my first wobbly steps in relational databases, I'd be grateful for any assistance.

TIA, mooseboy