Question

我在查询中使用左外连接。但是现在我得到了双重身份证，我的意思是我现在得到表1的id和table2的id都叫id。

有没有办法可以用类似的方式重命名（前缀）表2的id table2_id？无需使用＆＃39; AS table_nameOfColumn＆＃39;对于表2的每一栏

我当前的查询：

SELECT invoices.*, clients.* FROM invoices 
LEFT OUTER JOIN users ON invoices.employee_id = users.id 
LEFT OUTER JOIN clients ON users.client_id = clients.id
WHERE invoices.employee_id = 3

Answer 1

您只需为明确命名的列名称添加别名

即可

例如：

  SELECT invoices.id as invoce_id, clients.id as client_id FROM invoices 
  LEFT OUTER JOIN users ON invoices.employee_id = users.id 
  LEFT OUTER JOIN clients ON users.client_id = clients.id
  WHERE invoices.employee_id = 3

MySQL左外连接问题双ID

1 个答案: