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FDs in Relationships:
Enrols Relationship: None as it is many to many
Teaches Relationship: Course code → Instructor
Instructor → Course code
The next question is: How do we recognize the functional dependence in a database model?
Functional dependencies occur from the nature of the actual world that the database models. Often A and B are facts about an entity where A may be some identifier for the entity and B some characteristic. Functional dependencies cannot be automatically determined by studying one or more cases of a database. They can be determined only by a careful study of the actual world and a clear understanding of what every attribute means.
There are no thumb rules for determining FDs.
Functional dependence is an vital concept and a large body of formal theory has been developed about it.
What are the several forms of identity? a) Value b) Name c) Built-in
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A constraint named less_than_20 was defined on the field date_of_birth of table student. Delete this constraint. ALTER TABLE student DROP CONSTRAINT less_than_20;
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Benefits and limitations
With the linear commit protocol, sites are connected in a chain, and the subtransaction at the left-hand end of the chain initiates the protocol. Propose a crash recovery protocol
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