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Flights(FlightNo, DeptDateTime, Origin, ArrivalDateTime, Destination, Capacity, SoldSeats) Tickets(FlightNo, Seat, CustID)Where- flightNo is the PK of the flights table- DeptDateTime holds the date and time of the flights departure- Origin holds the airport code (e.g. RKE) of the flights origin- ArrivalDateTime holds the date and time of the flights arrival- Destination holds the airport code (e.g. ATL) of the flights destination- Capacity is the number of passenger seats the flight can hold- SoldSeats is the number of seats that are currently sold- FlightNo+Seat is the PK of the Tickets Table- FlightNo in the Tickets Table is an FK referencing the Flights Table- Seat is the seat assigned to that ticket (e.g. 7B)- CustID is the ID number of the customer that is assigned to that seatWrite a trigger or triggers that:- increments the SoldSeats field when a ticket is inserted- raises an exeception when an attempt to insert a ticket occurs if the flight is already sold out- decrements the SoldSeats field when a ticket is deletedTo provide appropriate transaction control your trigger should lock the associated flight row in the flights table before attempting to update the SoldSeats field.Add sample data and test your triggers.Have your triggers finished with some sample data entered by the start of class on November 16th.
Question: (a) Prepare an ERD for the scenario given below. (b) Convert the ER diagram produced in (a) above into its physical design. You have to choose an appropriate Pri
Design Documentation The Design Document shall be an extension of Requirements Analysis Design. "The Design Document will comprise a revised and much more detailed descrip
What are the benefits of prepared statements and place holders? Parameter binding operations automatically handle escaping of characters Encourage Statement reuse
differences between a classified catalog and a dictionary catalog
The PROJECT operation The project operation is used to choose the records with specified attributes as discarding the others based on some related criteria. This is denotes as ∏
How to draw an ER diagram to a finance companz
explain concept of decomposition?
Define the terms i) DDL ii) DML DDL: Data base schema is particular by a set of definitions expressed by a special language known as a data definition language. DML: A data
Determine the Strong and Weak Entity Based on the method of foreign key, there might be arise a situation when we have to relate an entity having a primary key of its own and a
Saving Derived Attributes to Avoid Re-computation As discussed, "redundancy means duplication of exact data". But, if multiple copies of same data are present in the system,
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