Question

Please help me with this question. I would really appreciate it. Please explain briefly I am trying to prepare for a test.

Consider the following relational database to manage concert and ticket sales. The relations are artist, concert, venue, seat, ticket, and fan. The schemas for these relations (with primary key attributes underlined) are:

Artist-schema = (artistname, type, salary)
Concert-schema = (artistname, date, venuename, artistfees)
Venue-schema = (venuename, address, seating_capacity)
Seat-schema=(venuename, row, seatnumber)
Ticket-schema = (fanID, date, venuename, row, seatnumber)
Fan-schema = (fanID, name, address, creditcardno)

Where:
--> artistname is a unique name for the artist (because of trademark/copyright rules no two artists have the same name).
--> type is an attribute whose value is chosen from “music”, “comedy”, “juggling”, or “other”
--> artistfees is a real number greater than 0
--> fanID is a unique ID given to a customer
--> creditcardno is a 16 digit credit card number starting with a 4 or a 5

QS) Does this database schema allow for one fan to have multiple tickets for a given concert? Justify your answer briefly.

Answer 1

In Fan-schema , fanID is the primary key of fan so it is unique for every fan. In the Ticket-schema fanID is not the primary key , the composite primary key is date,venuename,row and seatnumber. So for one fanID , multiple tickets can be booked . In the Concert-schema the composite primary key is date and venuename . So for a particular concert multiple rows and seatnumber can be booked.

So one fan can have multiple tickets for a given concert.

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