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Understanding Normalization in Database Design: An Essential Guide

Learn the key concepts of normalization in database design, including its purpose, terminology, types of normal forms, and practical examples to eliminate data anomalies effectively.

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Understanding Normalization in Database Design: An Essential Guide

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  1. Chapters 13 & 14 Normalization

  2. Agenda • Definition • Purpose • Terminology • Types of Normal Form • Examples

  3. Definition • Technique for producing a set of relations having the real primary key(s)

  4. Purpose • Eliminate insertion anomalies • Eliminate deletion anomalies • Eliminate modification anomalies

  5. Terminology • Functional dependency • Determinant • Transitive dependency

  6. Types of Normal Form • First normal form • No repeating group • Second normal form • every non-primary-key attribute is fully functionally dependent on the whole primary key • Third normal form • No transitive dependency • Boyce-Codd normal form • Every determinant is a candidate for primary key

  7. Types of Normal Form • Fourth normal form • No multi-valued dependency • Fifth normal form • No join dependency

  8. Relation Holds Book Information in a Bookstore BOOKS ( TITLE, ISBN, AUTHOR, PUB_NAME, PUB_ADD, TOTAL_COPIES_ORDERED, COPIES_IN_STOCK, PUB_DATE, CATEGORY, SELL_PRICE, COST) • Unique: ISBN, PUB_NAME

  9. BOOK (ISBN, TITLE, AUTHOR, PUBLISHER_NAME, TOTAL_COPIES_ORDEORED, COPIES_IN_STOCK, PUBLICATION DATE, CATEGORY, COST, SELLING_PRICE) • PUB (PBULISHER_NAME, PUBLISHER_ADDRESS)

  10. Relation Holds Student Information in the Dormitories • COLLDORM (STUNAME, STUID, HOMEADD, HOMEPHONE, DORMROOM, ROOMMATE_NAME, DORMADD, STATUS, MEALPLAN, ROOMCHARGE, MEALCHARGE) • Unique: STUID, DORMADD, DORMROOM, MEALPLAN

  11. STUDENT (STUID, STUNAME, HOMEADD, HOMEPHONE, DORMROOM, ROOMMATE_NAME, STATUS, MEALPLAN) • DORM(DORMROOM, DORMADD, ROOMCHARGE) • MEALS (MEALPLAN, MEALCHARGE)

  12. Rental Relation • ClientRental (clientNo, cName, propertyNo, pAdd, rentStart, rentFinish, rent, ownerNo, oName)

  13. Inspection Relation • Inspection (Pno, Padd, IdateAndItime, Comment, Sno, Sname)

  14. Work Relations • W1 ( EMPID, EMPNAME, DATE_HIRED, JOB_TITLE, JOB_LEVEL) • W2 (EMPID, EMPNAME, JOB_TITLE, RATING_DATE, RATER_NAME, RATING) • W3 (EMPID, EMPNAME, PROJECT#, PROJECT_NAME, PROJ_BUDGET, EMP_MANGER, HOURS_ASSIGN) • W4 (EMPID, EMPNAME, SCHOOL_ATTENDED, DEGREE, GRADUATION_DATE) • W5 (EMPID, EMPNAME, SSNO, DEPENDENT_NAME, DEPDENT_ADDRESS, RELATION_TO_EMP)

  15. Points To Remember • Definition • Purpose • Terminology • Types of Normal Form • Examples

  16. Assignment • Review chapters 5, 6, 13,14 • Read chapters 19, 20 • Assignments • Normalize 13.13-13.16, 14.9-14.10 to fourth normal form (identify the primary key, every determinant, highest violation, and normalized relations with one underline for pk and double underline for fk) • Chapter 13 assignment and assignment 9 due date: • Project (revised Enhanced ER) • Project (Normalization) • Project due date:

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