I think the qq// needs to be replaced with parenthesis. That's inside the quoted string so perl isn't going to do anything special with it. What's trying to happen there is a subselect which your version of MySQL may not support unless it is very recent. The subselect should be in parethesis. Try the following.
$rows = $dbh->do("UPDATE checkin
SET destination =
(SELECT destination
FROM checkin
WHERE firstname='Henry' AND lastname='Rollins')
WHERE firstname='Bill' AND lastname='Gates'
") || die "Couldn't insert record : $DBI::errstr";
---
print map { my ($m)=1<<hex($_)&11?' ':'';
$m.=substr('AHJPacehklnorstu',hex($_),1) }
split //,'2fde0abe76c36c914586c';
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