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inheritance

What is the difference between public, private, and protected inheritance in C++?

by IT Nursery

class A { public: int x; protected: int y; private: int z; }; class B : public A { // x is public … Read more

Tags access-specifier, c, c++-faq, encapsulation, inheritance

How to enforce data consistency across one-to-one relationship in an inheritance hierarchy

by IT Nursery

Consider this design for a typical school database: Person: —————– FirstName LastName SocialSecurityNumber Phone Email Student: —————– Grade Teacher: —————– Specialty As you … Read more

Tags database-design, inheritance, sql-server, subtypes

Polymorphic Association – is it bad? [duplicate]

by IT Nursery

This question already has answers here: Modeling Upvotes / Likes – one table per type, or one big table? [migrated] (2 answers) Closed … Read more

Tags database-design, inheritance, polymorphic-associations, schema

Abstract classes in SQL Server. Are they even possible?

by IT Nursery

I have a very specific question that I am surprised no one has yet asked. It involves a concrete class model and SQL … Read more

Tags database-design, inheritance, sql-server, subtypes

Transfer row from ‘parent’ to ‘child’ without creating duplicate and without knowing all ‘parent’ columns

by IT Nursery

I want to set up a database with different schemas that correspond to different data-entry systems. There needs to be a “master” (administration) … Read more

Tags duplication, inheritance, postgresql, schema

Postgresql inheritance based database design

by IT Nursery

I’m developing a simple babysitter application that has 2 types of users: a ‘Parent’ and the ‘Babysitter’. I’m using postgresql as my database … Read more

Tags database-design, inheritance, postgresql

Best practise for polymorphic associations in MySQL

by IT Nursery

I have a MySQL database with 3 tables holding the main classes of data: companies (company_id) persons (person_id, company_id) loans (loan_id, company_id) Both … Read more

Tags inheritance, MySQL, polymorphic-associations

Using table inheritance instead of mapping tables

by IT Nursery

This seems like a pretty common scenario: several types that all compose the same child type. This could typically look like so: — … Read more

Tags database-design, inheritance, postgresql, subtypes

How to drop inheritance?

by IT Nursery

I am new to PostgreSQL. The situation I have is someone created a child table inherits from the parent table. And dropped the … Read more

Tags inheritance, postgresql

Partial unique constraint spanning multiple tables in postgres

by IT Nursery

To enforce partial uniqueness in postgres, it is a well known workaround to create a partial unique index instead of an explicit constraint, … Read more

Tags inheritance, postgresql, unique-constraint
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