Explain and write the pseudocode for a Mapper/Reducer that takes as input a large file (possibly split into chucks) of integers and outputs:

a. The sum of the squares of each integer

b. The maximum integer

c. Assume you have a database with two relations (i.e. tables): customers and accounts.

The schema for customers is composed of the following attributes:

customerID (integer)

name (string)

address (string)

phone (string)

The schema for accounts is composed of the following attributes:

customerID (integer)

accountNumber (integer)

balance (float)

Write the following queries using SQL:

A. Find the customer name with account number 12345.

B. Find all customer names who have at least one account with balance >$100,000 Write the following queries using Relational Algebra:

C. Find all account numbers with balance <$20,000 D. Calculate the sum of all accounts for customer with ID=432