TAL Distributors is considering changing its business model so that many sales reps can represent one customer and one sales rep can represent many customers. Using this information, convert the following unnormalized relation to fourth normal form. The text represents a database table structure for a "Customer" entity. This includes the customer information and their associated representative details:- **Customer** table fields: - **CustomerNum**: Unique identifier for the customer. - **CustomerName**: Name of the customer. - **Street**: Street address of the customer. - **City**: City where the customer is located. - **State**: State where the customer is located. - **PostalCode**: Postal code for the customer's address. - **Balance**: Current account balance of the customer. - **CreditLimit**: Maximum credit limit available for the customer. - Nested fields for the **Representative** (Rep) associated with the customer: - **RepNum**: Unique number identifying the representative. - **LastName**: Last name of the representative. - **FirstName**: First name of the representative. - **Street**: Street address of the representative. - **City**: City where the representative is located. - **State**: State where the representative is located. - **PostalCode**: Postal code for the representative's address. - **Commission**: Commission details related to the representative. - **Rate**: Rate associated with the representative’s commission.This structure is useful for designing a customer database with related representative information linked within the same record.

EXPLANATION: The unnormalized form is also termed the non-first normal form. This form is defined as the database model such that any of the data elements do not satisfy the condition for the database normalization. The database systems that follow the unnormalized form are defined as non-relational databases. The major problem that is faced by the database systems that follow unnormalized form is data redundancy. The example for unnormalized form includes multivalued attributes that are present for any particular tuple.SOLUTION: A record should not include two or more independent multi-valued facts about an entity in the fourth normal form. Furthermore, the record must be in third normal form. Following are the steps to convert the relation in fourth normal form: The main key must be defined for the candidate key. The group of keys is known as the main key. CustNum and RepNum To be in second normal form, the relation must have all non-key qualities reliant solely on key attributes, hence separating a relation into two relations with the names Customer and Rep. Customer (CustomerNum, CustomerName, Street, City, State, PostalCode, Balance, CreditLimit, (RepNum, LastName, FirstName, Street, City, State, PostalCode, Commission, Rate)) Rep (RepNum, LastName, FirstName, Street, City, State, PostalCode) Due to the combination's primary key, a relation in the second normal form may still have a value repetition problem, necessitating the conversion of each table to the third normal form. Customer (CustomerNum, CustomerName, Street, City, State, PostalCode, Balance, CreditLimit) Rep (RepNum, LastName, FirstName, Street, City, State, PostalCode, Commission, Rate) A sales representative can represent a number of clients, and a number of sales representatives can represent a single customer, resulting in the following relationships. Customer (CustomerNum, CustomerName, Street, City, State, PostalCode, Balance, CreditLimit, RepNum) Rep (RepNum, LastName, FirstName, Street, City, State, PostalCode, Commission, Rate, CustmoreNum) There would be multivalued dependencies, so there must be another relation. CustomerRep (CustomerNum, RepNum) In Fourth Normal Form: Customer (CustomerNum, CustomerName, Street, City, State, PostalCode, Balance, CreditLimit,RepNum) Rep (RepNum, LastName, FirstName, Street, City, State, PostalCode, Commission, Rate,CustomerNum) CustomerRep (CustomerNum, RepNum)