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[lab-mysql-sql] Giorgio Giao #144

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60 changes: 60 additions & 0 deletions your-code/solution.sql
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Original file line number Diff line number Diff line change
@@ -0,0 +1,60 @@
SELECT *
FROM authors;

SELECT *
FROM titles;

SELECT *
FROM titleauthor;

SELECT *
FROM publishers;

/* CHALLENGE 1 */

SELECT titleauthor.au_id, au_lname, au_fname, title, pub_name
FROM titleauthor
INNER JOIN authors
ON titleauthor.au_id = authors.au_id
INNER JOIN titles
ON titleauthor.title_id = titles.title_id
INNER JOIN publishers
ON titles.pub_id = publishers.pub_id
ORDER BY titleauthor.au_id;

/* CHALLENGE 2 */

SELECT titleauthor.au_id, au_lname, au_fname, pub_name, COUNT(titles.title_id) AS Title_count
FROM titleauthor
INNER JOIN authors
ON titleauthor.au_id = authors.au_id
INNER JOIN titles
ON titleauthor.title_id = titles.title_id
INNER JOIN publishers
ON titles.pub_id = publishers.pub_id
GROUP BY titleauthor.au_id, pub_name
ORDER BY titleauthor.au_id DESC;

/* CHALLENGE 3 */

SELECT authors.au_id, au_lname, au_fname, SUM(sales.qty) AS Total
FROM authors
LEFT JOIN titleauthor
ON titleauthor.au_id = authors.au_id
LEFT JOIN sales
ON titleauthor.title_id = sales.title_id
GROUP BY authors.au_id
ORDER BY Total DESC
LIMIT 3;

/* CHALLENGE 4 */

SELECT authors.au_id, au_lname, au_fname, IFNULL(SUM(sales.qty),0) AS Total
FROM authors
LEFT JOIN titleauthor
ON titleauthor.au_id = authors.au_id
LEFT JOIN sales
ON titleauthor.title_id = sales.title_id
GROUP BY authors.au_id
ORDER BY Total DESC;