Mysql查询中的两个连接

Question

我试图制作一个mysql连接语句。我想加入Restauraunts的idRestauraunt和restaurant_categories的idRestauraunt。我的第二次加入我想加入category_categories的类别和idCategory的idCategories。我正在尝试使用的查询是

SELECT distinct r.* from Restaurants  r
JOIN restaurant_categories rc on(r.idRestaurant = rc.idRestaurant )
JOIN Categories c on (c.idCategories =rc.idCategories )
WHERE c.Category ='Pizza Hut'

错误代码：1066。不唯一的表/别名：'餐馆'

分类

+--------------+-------------+------+-----+---------+-------+
| Field        | Type        | Null | Key | Default | Extra |
+--------------+-------------+------+-----+---------+-------+
| idCategories | int(11)     | NO   | PRI | NULL    |       |
| Category     | varchar(45) | YES  |     | NULL    |       |
+--------------+-------------+------+-----+---------+-------+

餐馆

+--------------+-------------+------+-----+---------+-------+
| Field        | Type        | Null | Key | Default | Extra |
+--------------+-------------+------+-----+---------+-------+
| idRestaurant | int(11)     | NO   | PRI | NULL    |       |
| Name         | varchar(45) | YES  |     | NULL    |       |
| Password     | varchar(45) | YES  |     | NULL    |       |
| Email        | varchar(45) | YES  |     | NULL    |       |
| Number       | varchar(45) | YES  |     | NULL    |       |
+--------------+-------------+------+-----+---------+-------+

restaurant_categories

+--------------+---------+------+-----+---------+-------+
| Field        | Type    | Null | Key | Default | Extra |
+--------------+---------+------+-----+---------+-------+
| idCategory   | int(11) | YES  | MUL | NULL    |       |
| idRestaurant | int(11) | YES  | MUL | NULL    |       |
+--------------+---------+------+-----+---------+-------+