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I have tables A and B and then I have a many to many join table with foreign keys to both called a_b. Neither foreign key can be null and the combinations for the foreign keys to A and B are unique...
#2: Post edited
by
Alexei
·
2020-11-10T21:11:25Z (about 4 years ago)
added relevant tag
#1: Initial revision
by
Charlie Brumbaugh
·
2020-11-06T18:59:31Z (about 4 years ago)
Is it possible in MySQL to require each row in a table have at least one foreign key record in a join table?
I have tables A and B and then I have a many to many join table with foreign keys to both called a_b. Neither foreign key can be null and the combinations for the foreign keys to A and B are unique. In the business logic for the program, every record in the A table must have a relationship to at least one record in the B table. Is it possible to enforce that constraint at the database level? I don't think it is, but thought I would ask.