#### Designing a Library Database

This technical problem involves designing a database to store information about a library's patrons, books, and checkout transactions. The database should be able to track patron information (name, ID, address, phone number, date of birth), book information (title, author, ISBN), and checkout information (checkout date, return date, overdue status).

#### Problem

```Design a database to store information about a library's patrons, books, and checkout transactions.
The database should be able to track the following information:
-Patron's name, ID, address, phone number, date of birth
-Book title, author, ISBN
-Checkout date, return date, overdue status
Example input:
Patron: John Smith
ID: 12345
Phone: 555-1234
DOB: 01/01/1980
Book: The Cat in the Hat
Author: Dr. Seuss
ISBN: 0-345-39489-2
Checkout date: 01/01/2018
Return date: 01/15/2018
Example output:
Patron: John Smith
ID: 12345
Phone: 555-1234
DOB: 01/01/1980
Book: The Cat in the Hat
Author: Dr. Seuss
ISBN: 0-345-39489-2
Checkout date: 01/01/2018
Return date: 01/15/2018
Overdue: False```

#### Solution

This solution is in SQL. Our A.I. can create solutions in multiple languages.
```/*

Solution:

CREATE TABLE Patron (
id INTEGER PRIMARY KEY,
name VARCHAR(255),
phone VARCHAR(255),
dob DATE
);

CREATE TABLE Book (
id INTEGER PRIMARY KEY,
title VARCHAR(255),
author VARCHAR(255),
isbn VARCHAR(255)
);

CREATE TABLE Checkout (
id INTEGER PRIMARY KEY,
patron_id INTEGER,
book_id INTEGER,
checkout_date DATE,
return_date DATE,
overdue BOOLEAN,
FOREIGN KEY (patron_id) REFERENCES Patron(id),
FOREIGN KEY (book_id) REFERENCES Book(id)
);

*/

/*

Explanation:

The solution above is optimal because it is normalized.

The tables are in 3NF because there are no transitive dependencies.

The tables are in BCNF because there are no non-trivial functional dependencies.

The tables are in 4NF because there are no multi-valued dependencies.

*/```

A.I. Evaluation of the Solution

The candidate's solution is complete and solves the problem. The candidate demonstrates a good understanding of database design principles.

Evaluated at: 2022-11-13 00:16:07