[英]mysql join 2 user_ids in a row from users table
有2個表:
orders:
id requester_id supplyer_id status
1 423 1 reserved
2 500 1 supplied
3 222 2 reserved
...
users
id username register_date
1 admin 2012-01-01
2 smith 2013-01-01
...
423 John 2012-10-11
500 Doe 2012-12-11
222 name 2012-10-13
...
我想加入這兩個表並得到這個結果
id requester_username supplier_username status
1 John admin reserved
2 Doe admin supplied
3 name smith reserved
我實際上可以使用活動記錄(例如:)連接這些表:
$this->db->select('orders.*,users.username')
->from('orders')
->join('users','users.id = orders.requester_id')
->get()->result();
但我不知道如何同時獲取supplier username
。
嘗試添加第二個JOIN:
$this->db->select('orders.*,requesters.username,suppliers.username')
->from('orders')
->join('users AS requesters', 'requesters.id = orders.requester_id')
->join('users AS suppliers', 'suppliers.id = orders.supplier_id')
->get()->result();
在MySql中,您的查詢應類似於-
Select a.id, b.username, c.username, a.status
from orders a, users b, users c
where
a.requester_id = b.id
And
a.supplyer_id = c.id
謝謝
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