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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.
The traffic data mgmt. systems infrastructure plan describes the software, hardware, data network, and other elements that will support the TDMS. The infrastructure plan is based o
Explain pipelining. Ans: In order to describe pipelining in simple terms, think of it as breaking down processor functions into smaller and smaller parts. For instance,
1 - Serial RS232 comm port comunication 2 - NanoHTTPD serving a few processed pages 3 - System tray application to indicate status and access configuration forms 4 - SQLit
Define outer union operation of the relational algebra. Compute the outer union for the relations R and S given below. Outer Join - If there are any values in one tabl
Define tuple variable Tuple variable is a type of variable whose domain is the set of all tuples.
Problem: (a) Data mining is one of the best ways to analyse data and using software techniques, hidden and unexpected patterns and relationships in sets of data can be extrac
Differance between Unordered and ordered file ? Unordered file do no has any sequence although ordered file has arranged in a few sequence and data are assigned in ordered form
What is an object ID? Each class-derived table has an ID for primary key, one or more object IDs form primary key for association derived tables. An object ID is equivalent dat
what is 3nf
Question : (a) Database Management Systems (DBMS) is the foundation of business intelligence. Explain the following concepts related to DBMS: (i) Entity Relationship Diagr
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