Question: 1. 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.

1. 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

2. 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

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