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                > `join`連接兩張表進行查詢,大致分為內連接,外連接,右連接,左連接,自然連接 > 下面是一些使用的例子: ```php //用戶表左連接訂單表查詢訂單號 Db('user')->select([ 'field' => ['user.username','user.email','order.number'], 'join' => [ //這里的數組可以傳遞多個,滿足多表之間連接查詢 'left join `order` on order.userid=user.id and order.status=1' //... ], 'groupby' => 'user.id' ])->get(); //sql:SELECT user.username,user.email,order.number FROM `user` left join `order` on order.userid=user.id GROUP BY user.id ``` > SQL小常識:在 MySQL 中有兩個存儲引擎 MyISAM 和 InnoDB,每個引擎的優劣勢不同喲~
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