Top "Foreign-keys" questions

Here is my problem - I have 2 tables: WORKER, with columns |ID|OTHER_STAF| , where ID is primary key FIRM, …

In database design what do n:m and 1:n mean? Does it have anything to do with keys or relationships?

I searched for a solution to this problem on the Internet and checked the Stack Overflow questions, but none of …

I have to two tables namely employees_ce and employees_sn under the database employees. They both have their respective …

I'm trying to delete all tables from a database except one, and I end up having the following error: Cannot …

I'm designing my database schema using MySQL Workbench, which is pretty cool because you can do diagrams and it converts …

create table d(id numeric(1), code varchar(2)) After I create the above table how can I add a composite primary …

This seems to be a common error, but for the life of me I can't figure this out. I have …

I would like to delete rows which contain a foreign key, but when I try something like this: DELETE FROM …

I have set up a table that contains a column with a foreign key, set to ON DELETE CASCADE (delete …