mysql_selected_db, ar kazkaip panasiai turetu buti

> Taip pat noriu, kad automatiskai sukurtu lentele "users", skriptuka 
> papildau tokiomis komandomis:
>
> $sql = "USE content";
> $sql = "CREATE TABLE `users` (
>    `user_id` int(10) unsigned NOT NULL auto_increment,
>    `email` varchar(40) NOT NULL,
>    `registration_date` datetime NOT NULL,
>    PRIMARY KEY  (`user_id`),
>   UNIQUE KEY `email` (`email`),
>    KEY (`email`,`pass`)
>  )";
>
> Ismeta tokia pranesima, "No database selected" ir nesukuria nei DB, nei 
> lenteles. Kame cia gali buti beda? Dekoju is mintis.