how do I add a foreign key pointing to the same table using phpMyAdmin?
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21-08-2019 - |
Question
I have an existing InnoDB table which already has foreign keys pointing to different tables.
But when I try to create a foreign key pointing to the Primary index, I get an error (check data type).
The table is User with User_Id as the Primary.
I want a foreign key Manager_ID which is a FK to User_Id.
Both of INT Both of Length 10 Unsigned...
But I still get a data check error...?
Solution
Make sure that Manager_ID is not set to NOT NULL
.
You have to allow nulls on that field, as the top-most person in the company will have no manager.
I found a post over on the MySQL boards that might help.
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