$q = "SELECT u.login FROM users WHERE u.user_id = 1;";
Sorry, it should read:
$q = "SELECT u.login FROM users u WHERE u.user_id = 1;";
I accidently removed the "u" after users while removing line breaks to make it shorter to post here.
---------------------------(end of broadcast)--------------------------- TIP 9: the planner will ignore your desire to choose an index scan if your joining column's datatypes do not match