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studio-16.5.sql
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# Studio 16.5 - More SQL
# Hank DeDona
# 2/26/2020
CREATE TABLE book (
book_id INT AUTO_INCREMENT PRIMARY KEY,
author_id INT,
title VARCHAR(255),
isbn INT,
available BOOL,
genre_id INT
);
COMMIT;
CREATE TABLE author (
author_id INT AUTO_INCREMENT PRIMARY KEY,
first_name VARCHAR(255),
last_name VARCHAR(255),
birthday DATE,
deathday DATE
);
COMMIT;
CREATE TABLE patron (
patron_id INT AUTO_INCREMENT PRIMARY KEY,
first_name VARCHAR(255),
last_name VARCHAR(255),
loan_id INT
);
COMMIT;
CREATE TABLE reference_books (
reference_id INT AUTO_INCREMENT PRIMARY KEY,
edition INT,
book_id INT,
FOREIGN KEY (book_id)
REFERENCES book(book_id)
ON UPDATE SET NULL
ON DELETE SET NULL
);
COMMIT;
INSERT INTO reference_books(edition, book_id)
VALUE (5,32);
COMMIT;
CREATE TABLE genre (
genre_id INT PRIMARY KEY,
genres VARCHAR(100)
);
COMMIT;
CREATE TABLE loan (
loan_id INT AUTO_INCREMENT PRIMARY KEY,
patron_id INT,
date_out DATE,
date_in DATE,
book_id INT,
FOREIGN KEY (book_id)
REFERENCES book(book_id)
ON UPDATE SET NULL
ON DELETE SET NULL
);
COMMIT;
# 16.5.2 - Warm up queries
SELECT title, isbn FROM book WHERE genre_id IN (SELECT genre_id from genre where genres = 'Mystery');
SELECT b.title, a.first_name, a.last_name FROM book b INNER JOIN author a ON b.author_id = a.author_id WHERE a.deathday IS NULL;
# 16.5.3 - Loan out a book
# Note: I had to disable safe mode...
SET SQL_SAFE_UPDATES = 0;
# Change available to false for book
UPDATE book SET available=0 WHERE title='The Brutal Telling';
COMMIT;
# Add new row to loan
INSERT INTO loan (patron_id, date_out, book_id) VALUES (6, CURDATE() , 26);
COMMIT;
# Update patron table with loan ID
UPDATE patron SET loan_id = (SELECT MAX(loan_id) FROM loan) WHERE patron_id = 6;
COMMIT;
# 16.5.4 - Check a book back in
# Change available to true for book
UPDATE book SET available = 1 WHERE title='The Brutal Telling';
COMMIT;
# Update loan table with date_in to today
UPDATE loan SET date_in = CURDATE() where loan_id = 2; # We'd need to know the loan_id or some other value...
COMMIT;
# 16.5.5 - Wrap up query
SELECT p.first_name, p.last_name, g.genres FROM loan l INNER JOIN patron p ON p.patron_id = l.patron_id
INNER JOIN book b ON l.book_id = b.book_id
INNER JOIN genre g ON b.genre_id = g.genre_id
WHERE l.date_in IS NULL;