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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.
What are the ways of obtaining the connection parameters? Hardwire the parameters into the program. Ask for the parameters interactively. Get the parameters
Describes the several relationship constraints through giving suitable example? Constraints on relationships: There are two kinds of constraints on relationships. 1) Mapping
Example : Search the name, department number and salary of employees drawing minimum salary in that department. SELECT ENAME, SAL, DEPTNO FROM EMP WHERE SAL IN (SELECT MI
examples of fields in a database
What are the four main characteristics of the database approach? The four major characteristics of the database approach are: 1. Self-describing nature of a database system. 2.
Project: Microsoft Access You have been asked by the ABC Tanning Salon to create a database that can be used to track the salon's customers. You are to create a table in Access
Example -Find the employee name, salary, department number and average salary of his/her department, for those employees whose salary is more than the average salary of that depart
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Data independence seems that "the application is independent of the access strategy and storage structure of data". In other words, the ability to change the schema definition in o
Define query optimization. Query optimization refers to the process of search the lowest -cost method of evaluating a given query.
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