mysql - 多选用户名 SQL

Question

您好，我想加入 3 张 table

表导出

id | id_product | id_user  | id_loan
1  |     516    |    10    |    1

表用户

id |    Name    |
 5 |    John    |
10 |    Justin  |

表贷款

id |   id_user  | Quantity |
 1 |     5      |    23    |

我的sql代码是

Select *
From Export
join User ON Export.id_user = User.id
join Loan ON Export.id_loan = Loan.id

我如何选择我的结果

ID Product | Export User | Loan User | Quantity
   516     |    Justin   |   John    |    23

谢谢你

Answer 1

您需要加入多个用户实例

Select id_product,User.name as exportUser,u1.name as loanUser,quantity
From Export
left join User ON Export.id_user = User.id
left join Loan ON Export.id_loan = Loan.id
left join user u1 on Export.id_loan=u1.id