根据另一个表

Question

我需要在MariaDB中创建两个表companies和locations。

companies
+------------+-------------+--------------+
| company_id | location_id | company_name |
+------------+-------------+--------------+
|          1 |           2 | abc          |
|          2 |           9 | xyz          |
+------------+-------------+--------------+

locations
+-----+-------------+---------------+------------+
| key | location_id | location_name | company_id |
+-----+-------------+---------------+------------+
|   1 |           1 | London        |          1 |
|   2 |           2 | Hong Kong     |          1 |
|   3 |           3 | Berlin        |          1 |
|   4 |           7 | Hong Kong     |          2 |
|   5 |           2 | London        |          2 |
|   6 |           9 | NY            |          2 |
+-----+-------------+---------------+------------+

<location_id 1，2和3与company_id 1与company abc相关联， location_id 7，2和9 company_id 2与company xyz相关联。因此，location_id company的{​​{1}}应仅接受值abc，1和2。同样，3 location_id的{​​{1}}也应仅接受值company，xyz和7。 2并非由他们自己独有，而是9和location_id的组合。有什么方法可以用location_id或类似方法设置这些表来实现这个目标吗？