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Found 1 result

  1. sherlockxhouse
    I am just new to relational algebra probably a pre-step before learning SQL queries. Can you help me make the expressions of relational algebra expression for each of the following queries. This is the table contained inside a bus driver database. driver ( driver_id, driver_name, age, rating ); bus ( bus_id, bus_name, color); reserves ( driver_id, bus_id, date); a. Find the names of drivers who have reserved at least three busses. b. Find the names of drivers who have reserved all busses. c. Find the names of drivers who have reserved all busses called Shuttle. d. Find the IDs of drivers whose rating is better than some driver called Paul. I would be grateful if somebody can help me here.
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