How important are constraints like NOT NULL and FOREIGN KEY if I'll always control my database input with PHP?

Question

I am trying to create a column in a table that\'s a foreign key, but in MySQL that\'s more difficult than it should be. It would require me to go back and make certain changes

Answer 1

Use the database for structural data integrity, and use the BR layer for the rest. And catch errors as early as possible. They work together.

With luck, when your code as matured, you won't experience databse RI errors; and you can proudly announce yourself to be the first.