Database normalization
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This document discusses database normalization. It explains that normalization is the process of organizing data fields and tables to reduce redundancy and improve data integrity. The key steps in normalization include first normal form, second normal form, and third normal form. First normal form ensures each attribute contains atomic values. Second normal form requires attributes depend on the full primary key. Third normal form removes transitive dependencies on primary keys. The document provides examples of normalization and discusses its advantages in reducing redundancy and improving performance and data accuracy.
Database normalization
- 2. Database Normalization Arun .R. Menon arunrmenon555@gmail.com www.facebook.com/arunrmenon twitter.com/iamarunmenon in.linkedin.com/in/mearunmenon +919846629020
- 3. Disclaimer: This presentation is prepared by trainees of baabtra as a part of mentoring program. This is not official document of baabtra –Mentoring Partner Baabtra-Mentoring Partner is the mentoring division of baabte System Technologies Pvt . Ltd
- 4. Database Normalization • What is normalization? • Need of normalization ?
- 5. What is normalization? • Database normalization is the process of organizing the fields and tables of a relational database. • It is a multi-step process that puts data into tabular form and linking data using relation tables.
- 6. Need of normalization ? • Avoid redundancy. • Increase performance • Easy Updating • Accuracy
- 7. • Advantages – Reduce redundancy – Easy data updation – Reduce errors • Disadvantages – Increase number of tables – Complexity increases
- 8. First Normal Form (1NF) • A relation is said to be in 1NF if , all attributes contain atomic values.
- 9. candidate keys {int_id,vchr_subject_opted} Primary key {int_id}
- 10. Second Normal Form(2NF) • A table is in 2nf if – It is in 1nf – Every non prime attribute must dependent on the the entire primary key.
- 11. candidate keys {int_id,vchr_subject_opted} Primary key {int_id} candidate keys {int_id,vchr_subject_opted}
- 12. Third Normal Form(3NF) • A table is in 3NF if – It is in 2NF – No attributes is transitively dependent to primary key
- 13. Primary key {pk_int_stu_id} Primary key {pk_int_stu_id} Primary key {pk_int_zip_id}
- 14. • Online Exam Management System • Users: • Admin • Student • Admin • Login • View Profile • Edit Profile • Facility to manage student • Facility to manage exam • Student • Attend exams • View mark
- 15. • tbl_user • tbl_user_role • tbl_log • tbl_user_details • tbl_subject • tbl_exam • tbl_question • tbl_options • tbl_answer • tbl_exam_details
- 18. Thank You
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