Database normalization

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Database normalization

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Database normalization

  1. 1. Database Normalization Arun .R. Menon arunrmenon555@gmail.com www.facebook.com/arunrmenon twitter.com/iamarunmenon in.linkedin.com/in/mearunmenon +919846629020
  2. 2. 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
  3. 3. Database Normalization • What is normalization? • Need of normalization ?
  4. 4. 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.
  5. 5. Need of normalization ? • Avoid redundancy. • Increase performance • Easy Updating • Accuracy
  6. 6. • Advantages – Reduce redundancy – Easy data updation – Reduce errors • Disadvantages – Increase number of tables – Complexity increases
  7. 7. First Normal Form (1NF) • A relation is said to be in 1NF if , all attributes contain atomic values.
  8. 8. candidate keys {int_id,vchr_subject_opted} Primary key {int_id}
  9. 9. 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.
  10. 10. candidate keys {int_id,vchr_subject_opted} Primary key {int_id} candidate keys {int_id,vchr_subject_opted}
  11. 11. Third Normal Form(3NF) • A table is in 3NF if – It is in 2NF – No attributes is transitively dependent to primary key
  12. 12. Primary key {pk_int_stu_id} Primary key {pk_int_stu_id} Primary key {pk_int_zip_id}
  13. 13. • 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
  14. 14. • tbl_user • tbl_user_role • tbl_log • tbl_user_details • tbl_subject • tbl_exam • tbl_question • tbl_options • tbl_answer • tbl_exam_details
  15. 15. Tbl_user Tbl_user_roles Tbl_log Tbl_user_details Tbl_subject
  16. 16. tbl_exam tbl_question tbl_options tbl_answer tbl_exam_details
  17. 17. Thank You
  18. 18. Want to learn more about programming or Looking to become a good programmer? Are you wasting time on searching so many contents online? Do you want to learn things quickly? Tired of spending huge amount of money to become a Software professional? Do an online course @ baabtra.com We put industry standards to practice. Our structured, activity based courses are so designed to make a quick, good software professional out of anybody who holds a passion for coding.
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