Question

I have the following tables:

PROFILE table {
user_id INT, 
apitype enum('facebook' , 'main')
}

USER table {
id INT
}

PROFILE.user_id is a foreign key that points to the ID in USER table, but only if PROFILE.apitype = 'main'

so basically PROFILE.user_id does not refer to an ID in the USER table if PROFILE.apitype != 'main'

How can I accomplish this in MYSQL?

Answer 1

You can probably use a trigger which is fired before insert/update and checks the value of apitype. There’re even some ways to throw errors in MySQL triggers, e.g. check this.