Consider the following schema for a database that keeps information about business trips and their associated expenses by employees. Italics indiates a foreign key.

EMP(SSN, Name, DeptNo, JobTitle, Salary) TRIP( TripId, DepartureCity, DestinationCity, DepartureDate, ReturnDate, SSN) EXPENSE(TripId, Item, Date, Amount)

Write relational algebra queries for each of the following:

a. Get a list of all the different destination cities where the employess have taken trips.

b. Find all the employee information for employees who work in Department 10.

c. Get complete trip records (but not their associated expenses) for all trips with departure dates after January 1 of the current year.

d. Find the names of all employees who have departed on trips from London.

e. Find the SSN of all employees who have any single expense item of more than $1000 for any trip.

f. Find the names of all employees who have any expense item with value "Entertainment".

g. Find the destination cities of all trips taken by employees who have the job title of "Consultant".

h. Find the names and departments of all employees who have a single expense item of over $1000 since January 1 of this year.

i. Find the items and amounts of all expenses for a trip to Cairo beginning on January 3 of this year taken by employee Jones.

j. Find the names, departments, and job titles of all employees who have any expense item with value "Service charge" for trips take to Melbourne last year, along with the date and amount of the expense.