[Solved]Functional Dependency Possible Sources Information Defines Functional Dependencies Hold Am Q37253758

a) What is a functional dependency? What are the possible sources of the information that defines the functional dependencies that hold among the attributes of a relation schema? b) Consider the following relational database belonging to a rental-car company, where keys are underlined Customers(driverLicenseNumber, name, address) Cars(VIN, manufacturer, model, year, color) Rental(driverLicenseNumber. VIN, dateOfRental) Here “VIN” is the unique ID of each car. And “dateOfRental” is the date on which a customer rented a car. i. Write down a query in relational algebra for this task: Find the names of all the consumers who have rented a car manufactured by “Toyota”. (Note: Your answer should be a relational-algebra expression.) i. Write down a query in SQL for this task: Find the VINs of those red cars that have been rented at most 10 times. (Note: Your answer should be a SQL statement.) Show transcribed image text a) What is a functional dependency? What are the possible sources of the information that defines the functional dependencies that hold among the attributes of a relation schema? b) Consider the following relational database belonging to a rental-car company, where keys are underlined Customers(driverLicenseNumber, name, address) Cars(VIN, manufacturer, model, year, color) Rental(driverLicenseNumber. VIN, dateOfRental) Here “VIN” is the unique ID of each car. And “dateOfRental” is the date on which a customer rented a car. i. Write down a query in relational algebra for this task: Find the names of all the consumers who have rented a car manufactured by “Toyota”. (Note: Your answer should be a relational-algebra expression.) i. Write down a query in SQL for this task: Find the VINs of those red cars that have been rented at most 10 times. (Note: Your answer should be a SQL statement.)

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Answer to a) What is a functional dependency? What are the possible sources of the information that defines the functional depende… . . .