Question

Colonial Adventure Tours calculates the total price of a trip by adding the trip price plus other fees and multiplying the result by the number of persons included in the reservation. List the reservation ID, trip name, customer’s last name, and total cost for all reservations where the number of persons is greater than four. Use the column name TotalCost for the calculated field.

Answer 1

Answer:

The following query is used to display TripName. Reservationld, FirstName. LastName and TotalCost of trip by adding the trip price plus other fees and multiplying the result by the number of persons which have number of persons >4.

Query:

SELECT ReservationlD, Trip.TripName. Customer.LastName. Customer.FirstName. (TripPrice+OtherFees) 'NumPersons as TotalCost FROM Reservation, Trip, Customer WHERE NumPersons>4 AND Reservation.TriplD=Trip.TriplD AND

Customer. CustomerNum=Reservation.CustomerNum:

Explanation:

• Select clause is used to retrieve data from specified database table or relation and returns the data in the form of table.
• ReservationID. Trip.TripName. Customer.LastName. Customer.FirstName are the column name of table.
• (TripPrice+OtherFees) 'NumPersons will calculate the total cost of the Trip and stored it into TotalCost column.
• As clause is used to give new name TotalCost to resultant column.
• FROM clause specifies one or more table from where records to be retrieved. o Reservation. Trip and Customer are the table name.
• WHERE clause is used in SQL query to retrieve only those records that satisfy the specified condition