Mysql将表1中的同一列作为外键引用到表2中的两列

Question

I have two mysql tables with the second one having foreign key references to the first one. The first table is as follows:

1st Table name: treeview

+----+-----------+-----------+-----------+
| id | name      | text      | parent_id |
+----+-----------+-----------+-----------+
|  1 | BrandTree | BrandTree | 0         |
|  2 | TShirt    | TShirt    | 1         |
|  3 | ManForce  | ManForce  | 2         |
|  4 | PayTM     | PayTM     | 2         |
+----+-----------+-----------+-----------+

I am using this table to generate a jstree. And my second table is as follows:

2nd table name: annotations:

+--------+-------------------------------------+--------------+-----------+
| ann_id | imagename                           | locationName | brandname |
+--------+-------------------------------------+--------------+-----------+
|      1 | 95-20180527-190018-205342-00002.jpg |            2 |         3 |
|      2 | 95-20180527-190018-205342-00005.jpg |            2 |         4 |
+--------+-------------------------------------+--------------+-----------+

In the second table, the locationName and brandname have foreign key references to first table id column. I am using the following code to retrieve the table:

select annotations.imagename, treeview.name, treeview.text 
from annotations 
inner join treeview on treeview.id = annotations.locationName 
and inner join treeview on treeview.id = annotations.brandname;

The above code provides a Empty set.

Can I have the id column from table 1 as foreign key for two columns in table 2? How do i fetch in this case?

Answer 1

That's doing one join, twice

select annotations.imagename, tv1.name, tv2.name 
from annotations 
inner join treeview tv1 on tv1.id = annotations.locationName 
inner join treeview tv2 on tv2.id = annotations.brandname;

I think, haven't got mysql handy

Answer 2

You should use two join with thetreeview table one for each column that refer to the table annotations

    select annotations.imagename, tv1.name, tv1.text, t2.name, tv2.text
    from annotations 
    inner join treeview tv1 on tv1.id = annotations.locationName 
    inner join treeview tv2  on tv2.id = annotations.brandname;

Answer 3

You have to use different alias names for treeview tables that you have used twice. And not required and before inner join... .

Query

select `t1`.`imagename`, `t2`.`name`, `t3`.`text`
from `annotations` as `t1` 
inner join `treeview` as `t2`
on `t2`.`id` = `t1`.`locationName`
inner join `treeview` as `t3` 
on `t3`.`id` = `t1`.`brandname`;

Find a demo here

Answer 4

从注释a，树视图t1，树视图t2中选择一个图像名称，t1名称，t2名称，其中a.locationName = t1.id && a.brandname = t2.id;