cookie password stuff

[mr e]

ok how come i cant do this
[sql]
$bbuserinfo = $sql->query("SELECT * FROM user WHERE password=$ _COOKIE[bbpassword]");
[/sql]

but i can do this
[sql]
$bbuserinfo = $sql->query("SELECT * FROM user WHERE userid=$ _COOKIE[bbuserid]");
[/sql]

i've looked at my cookies and everything is there, why can i do one, but not the other? and yes this is on a non-vb page