April 2001
Beginner
792 pages
17h 51m
English
Content preview from Microsoft® SQL Server™ 2000 Programming by ExampleBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Creating and Altering Tables
The first step in the databasedesign process is creating the entity relationship model, which is a conceptual representation of the database. The entity relationship model is comprised of entities, attributes, and relationships. An entity represents a real-world object, such as cars, employees, orders, students, courses, and teachers. Each entity has characteristics,which are called attributes. For example, the entity called employee has these attributes: Social Security number (SSN), last name, and first name. The last piece is the relationship, which is a link between two or more tables. There are three types of relationships: one-to-one (1:1), one-to-many (1:M), and many-to-many (M:N). For example, there's a one-to-many ...
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