# relational algebra | Algebra homework help

COSC 2307 Assignment # 1 (Relational Algebra) Please type your answers and submit a hard copy by Oct 2, 2013 Question 1: Use the attached database to provide the relational algebra which would list the requested information (showing the result relation for EACH STEP). (6 marks each – total 48 marks) a. Give the details of all suppliers in the Sault Ste Marie. b. List all inventory items with a quantity less than 100 units c. List all the inventory items stored in Sudbury d. Give the supplier details (name and id) for those located in Sudbury. e. Document Preview: COSC 2307 Assignment # 1 (Relational Algebra) Please type your answers and submit a hard copy by Oct 2, 2013 Question 1: Use the attached database to provide the relational algebra which would list the requested information (showing the result relation for EACH STEP). (6 marks each – total 48 marks) a. Give the details of all suppliers in the Sault Ste Marie. b. List all inventory items with a quantity less than 100 units c. List all the inventory items stored in Sudbury d. Give the supplier details (name and id) for those located in Sudbury. e. List all the supplier names who supply all the red parts. f. List the details of parts supplied by Quality g. List the part number of all parts supplied and located in the same city. h. List the supplier details for suppliers who do not supply blue parts. Question 2: Consider the following schema of an online flight reservation agency. Customer(cid, lastName, firstName, dob) Flight(fid, airline, fromCity, toCity, stops, onTime) Reservation(cid, fid, date) Attribute dob is the customer’s date of birth, stops is the number of stops (0–??) a flight requires, and onTime is a percentage (0-100) indicating how often a flight is on time. Keys are underlined. The set {lastName, firstName, dob} is also a key for Customer. However, the set {airline, fromCity, toCity, stops, onTime} is not a key for Flight since an airline may provide, say, di_erent flights with two stops from Bu_alo to Orlando, one stopping in Atlanta and one in New York, both of which are always on time. Attributes cid and fid in Reservation are foreign keys referencing homonymous attributes in Customer and Flight, respectively. Write Relational Algebra queries only that find (each 6 marks, except last two which weight 8 marks – total 52 marks): 1. cid’s of customers who reserved some flight to Boston and some flight to New York. 2. cid’s of customers who reserved some flight to Miami or some flight to Houston, but not both. 3. cid’s of customers who never reserved…

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