检索具有类似列mysql

Question

我的表格如下：

reg table

id  | user_id
--------------
7   | 8
10  | 11

位置表

id | reg_id | location_number
-----------------------------
4  | 7      | 111111
5  | 10     | 222222
6  | 10     | 333333

机器表

id | location_id | type
-----------------------
1  | 4           | local
2  | 5           | local
3  | 6           | international

我想要的结果是检索与其他相关数据相同的reg_id，如下所示：

reg_id  | location_number | user_id | location_id
-------------------------------------------------
10      | 222222          | 11      | 5
10      | 333333          | 11      | 6

我的查询是：

select * from reg
join location on reg.id = location.reg_id
join machines on location.id = machines.location_id
where reg.id = 10

但是这个查询只返回一行。

需要协助才能达到上述效果。感谢

Answer 1

也许你可以试试：

    select location.reg_id, location. location_number, reg.user_id, machines.location_id 
    from reg
    join location on reg.id = location.reg_id
    join machines on location.id = machines.location_id
    where reg.id = 10