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Yanka [14]
2 years ago
9

Describe how you would define the relation Brother-in-Law whose tuples have the form (x, y) with x being the brother-in-law of y

. b. Give appropriate relational algebra and SQL expressions that return the relation Brother-in-Law.
Computers and Technology
1 answer:
damaskus [11]2 years ago
8 0

Answer:

The expression is :

π[cd) + π(g,h) ],[π(e,f)+π(a,b)])

We will use foreign key and primary key

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Write a Python program to balance a checkbook. The main function needs to get the initial balance, the amounts of deposits, and
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Answer:

def deposit(deposit_amount, balance):

   balance += deposit_amount

   return balance;

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   balance -= check_amount

   return balance;

balance = float(input("Enter the initial balance: "))

transaction = input("Choose transaction method - D to deposit, C to process check, Q to quit: ")

while transaction != 'Q':

   if transaction == 'D':

       deposit_amount = float(input("Enter amount to be deposited: "))

       balance = deposit(deposit_amount, balance)

       print("Current balance is: " + str(balance))

   elif transaction == 'C':

       check_amount = float(input("Enter amount to process check: "))

       if balance >= check_amount:

           balance = process_check(check_amount, balance)

           print("Current balance is: " + str(balance))

       else:

           print("Not enough money!")

   else:

       print("Invalid input!")

   transaction = input("Choose transaction method - D to deposit, C to process the check, Q to quit: ")

print("Your final balance is: " + str(balance))

Explanation:

- Create functions to handle deposits and checks

- Ask the user for the initial balance and transaction to be made

- Initialize a while loop iterates until the user enter Q

- Ask the deposit amount or check amount depending on the transaction chosen

- Calculate and print the current balance for each transaction

- Print the final balance

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