Question : I have a product table and it is foreign key for product ingredients table. Is there a way […]
MySQL foreign key error
Question : I need to update rows in a child table,but I am getting following error while I run the […]
Foreign Key to Multicolumn Primary Key?
Question : I have three connected table in my design. Basic logic is when a category deleted, also delete records […]
Is there a way to avoid duplicating the definition of a foreign key?
Question : I was wondering about this example CREATE TABLE cities ( city varchar(80) primary key, location point ); CREATE […]
How to design to avoid duplicate Foreign keys
Question : I wasn’t really sure how to title this question. I have three tables User, Photo and Album. A […]
Copying table subset from one database to another with same schema
Question : I am trying to subset of a table from one table to another users(id, name, referrer_id, country_id) this […]
Clarification on Cardinality and Participation
Question : I’m currently redesigning a schema with 20 or so tables and my first task is to create an […]
What’s an alternative solution to using a null value for a foreign key field?
Question : I have a few tables in my database which contain a Foreign Key field linking to another table. […]
Table structure for validating data using category and subcategory fields
Question : I am creating a simple budget application, and the primary table will be a transaction table that contains […]
Proper database structure for storing multiple foreign keys
Question : I am using MySQL 5.7.25 and need to store multiple foreign keys for multiple columns. Scheme of my […]