[support] D7 Sql USING syntax

Hi All I am trying to write a sql query in D7.

SELECT id, exp, name FROM {resubmt_users_skills} LEFT JOIN {resubmt_skill_ids} USING (id) WHERE resubmt_users_skills.uid = $user.uid

The above query I want to write in D7.

$query = db_select('resubmt_users_skills' , 'us'); $query->leftJoin('resubmt_skill_ids' , 'si'); $query->condition('USING(id)'); $query->condition('us.uid = :uid' , array(':uid' => $user->uid)); $result = $query->execute()->fetchAssoc();

Looks above syntaxt is not correct. Can somebody pls tell me whats the fault here and solution for that.

Thanks

Kamal