Tag: foreign-key-relationship

Laravel foreign key onDelete(‘cascade’) not working

eloquent foreign-key-relationship laravel sql

I have a many-to-many relationship between User & Role, with a role_user table. My migrations are setup as so (simplified): users table: public function up() { Schema::create(‘users’, …

How to Implement Referential Integrity in Subtypes

database foreign-key-relationship relational-database sql

I have the following tables in a relational database: Basically, ReadingSwitch and ReadingValue are subtypes of Reading and SwitchSensor and AnalogSensor are subtypes of Sensor. A reading can either be a SwitchReading or ValueReading value – it cannot be both, and a Sensor can either be an AnalogSensor …