Inheritance & PolymorphismIn Relational Databases

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Inheritance & Polymorphism In Relational Databases solving some common problems in web development

The Problem ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Own Tables ,[object Object],[object Object],[object Object],[object Object],SELECT * FROM books WHERE id = 7 SELECT id, title, ‘book’ AS type FROM books UNION SELECT id, title, ‘television’ AS type FROM televisions

Single table inheritance (STI) ,[object Object],[object Object],[object Object],[object Object],SELECT * FROM products WHERE id = 7 SELECT id, title, type FROM products

Class Table Inheritance (CTI) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],SELECT books.*, products.* FROM books JOIN products ON(products.id = books.product_id) WHERE books.id = 7 SELECT products.id, products.title, books.id, televisions.id FROM products LEFT JOIN books ON(books.product_id = products.id) LEFT JOIN televisions ON(televisions.product_id = products.id)

Another Problem ,[object Object],[object Object],[object Object]

Multiple Tables ,[object Object],[object Object],[object Object]

Multiple Relationships ,[object Object],[object Object],[object Object],[object Object],[object Object]

Class Table Inheritance ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Polymorphism ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

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