doc15 - 1 Third Normal Form A table is said to be in 3NF if...

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1) Third Normal Form: A table is said to be in 3NF if both of the following conditions hold. A) Table should be in 1NF. B) Every non-prime attribute of table must be dependent on primary key, or we can say that, there should not be the case that a non-prime attribute is determined by another non-prime attribute. So this transitive functional dependency should be removed from the table. Student_ID Student_Name City Zip In the above table, Student_ID is Primary key, but city depends upon Zip. The dependency between zip and city is called transitive dependency (As a non-prime attribute is determined by another non- prime attribute). Hence to apply 3NF, we need to move the city to new table, with Zip as primary key. Student_ID Student_Name Zip Zip City a) Functional Dependency diagram for Grade Report Relation: Student_ID Student_Nam e Campus_Addres s Major Course_ID Course_Title Instructor_Nam e Instructor_Location Grade
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  • Fall '16
  • primary key, Candidate key, Database normalization, student_id

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