7.6: Extended Resources
- Page ID
- 93676
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- A database schema is the skeleton structure that represents the logical view of the entire database. It defines how the data is organized and how the relations among them are associated. It formulates all the constraints that are to be applied on the data.
A database schema defines its entities and the relationship among them. It contains a descriptive detail of the database, which can be depicted by means of schema diagrams. It’s the database designers who design the schema to help programmers understand the database and make it useful.
Tutorials Points Lesson on Schemas
- This video shows converting ER Diagrams to Schemas | SQL - Discuss the role of designing databases in the analysis and design of an information system. Learn how to transform an entity-relationship (ER) Diagram into an equivalent set of well-structured relations
A YouTube video on Converting ER Diagrams into Schemas
- Normalization? 1NF, 2NF, 3NF, BCNF Database Example - The inventor of the relational model Edgar Codd proposed the theory of normalization with the introduction of the First Normal Form, and he continued to extend theory with Second and Third Normal Form. Later he joined Raymond F. Boyce to develop the theory of Boyce-Codd Normal Form.
From Guru 99 a good lesson about Database Normalization
- Video on Normalizations has three steps: 1nf, 2nf, and 3nf. These stand for first normal form, second normal form, and third normal form. Each step has rules on what is allowed or not allowed in our database design. Each normal form gets progressively more strict.
YouTube video on Normalizations
- Video on Multivalued dependencies According to database theory, a multivalued dependency is a full constraint between two sets of attributes in a relation. In contrast to the functional dependency, the multivalued dependency requires that certain tuples be present in a relation.
Wiki page on Multivalued Dependency : https://en.wikipedia.org/wiki/Multivalued_dependency
A 2 part YouTube video set on Multivaried Dependency: