AI Features

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All LessonsFree Lessons (5)

Introduction

What to Expect Before the Advent of Databases Disadvantages of File-Based System

Fundamental Concepts

What is a Database?Database management systems (DBMS)An Example of a Database Characteristics of the Database Approach Benefits of the Database Approach Quiz!

Data Modeling

Introduction to Data Models Schemas and Instances The Three-Schema Architecture Data Independence Classification of Database Management Systems Quiz!

Entity-Relationship Data Model

Intro to Entity-Relationship Model

Entities, Entity Sets and Entity Types

Relationships, Relationship Sets and Relationship Types

Degrees of Relationship Types

Binary Relationship Type Constraints

Attributes of Relationship Types

Weak Entity Types

Solution to Exercise 1

Solution to Exercise 2

The Relational Data Model

Relational Model Concepts Properties of a Table Introduction to Database Keys Integrity Rules and Constraints Relational Database Schemas Common Relational Database Operations Quiz!

Functional Dependencies

Intro to Functional Dependencies Rules of Functional Dependencies Dependency Diagrams Quiz!

Normalization

What Is Normalization?First Normal Form Second Normal Form Third Normal Form Boyce-Codd Normal Form Exercise 1 Solution to Exercise 1 Exercise 2 Solution to Exercise 2 Quiz!

Structured Query Language

Structured Query Language (SQL)SQL Data Types and Operators SQL Constraints CREATE, DROP, and USE Databases CREATE, DROP, and INSERT Table The SELECT Clause The WHERE Clause The AND & OR Clauses Aggregate Functions in SQL ORDER BY & GROUP BY The HAVING Clause Alias Syntax SQL Joins INNER JOIN LEFT JOIN RIGHT JOIN Exercise 1 Solution to Exercise 1 Exercise 2 Solution to Exercise 2 Exercise 3 Solution to Exercise 3 Exercise 4 Solution to Exercise 4

Conclusion

Where to Go from Here

Database Design Fundamentals for Software Engineers

Weak Entity Types

In this lesson, we will look at the last component of our ER model.

We'll cover the following...

- Weak entity types

Weak entity types

Entity types that do not have key attributes of their own are called weak entity types like the DEPENDENT entity type in the company database ...