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[lab-mysql-select]SabirKarimov #30

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39 changes: 39 additions & 0 deletions solution.sql
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Original file line number Diff line number Diff line change
@@ -0,0 +1,39 @@
CREATE DATABASE publications;

USE publications;
/* Challenge 1 */
SELECT authors.au_id AS AUTHOR_ID, authors.au_lname AS LAST_NAME, authors.au_fname AS FIRST_NAME, titles.title AS TITLE, publishers.pub_name AS PUBLISHER
FROM authors
JOIN titleauthor ON authors.au_id = titleauthor.au_id
JOIN titles ON titleauthor.title_id = titles.title_id
JOIN publishers ON titles.pub_id = publishers.pub_id;

/* Challenge 2 */
SELECT authors.au_id AS AUTHOR_ID, authors.au_lname AS LAST_NAME, authors.au_fname AS FIRST_NAME, publishers.pub_name AS PUBLISHER,
COUNT(titles.title_id) AS TITLE_COUNT
FROM authors
JOIN titleauthor ON authors.au_id = titleauthor.au_id
JOIN titles ON titleauthor.title_id = titles.title_id
JOIN publishers ON titles.pub_id = publishers.pub_id
GROUP BY authors.au_id, publishers.pub_name
ORDER BY TITLE_COUNT DESC;

/* Challenge 3 */
SELECT authors.au_id AS AUTHOR_ID, authors.au_lname AS LAST_NAME, authors.au_fname AS FIRST_NAME,
COUNT(titles.title_id) AS TITLE_COUNT
FROM authors
JOIN titleauthor ON authors.au_id = titleauthor.au_id
JOIN titles ON titleauthor.title_id = titles.title_id
GROUP BY authors.au_id, authors.au_lname, authors.au_fname
ORDER BY TITLE_COUNT DESC
LIMIT 3;

/* Challenge 4 */
SELECT authors.au_id AS AUTHOR_ID, authors.au_lname AS LAST_NAME, authors.au_fname AS FIRST_NAME,
COUNT(titles.title_id) AS TOTAL
FROM authors
LEFT JOIN titleauthor ON authors.au_id = titleauthor.au_id
LEFT JOIN titles ON titleauthor.title_id = titles.title_id
GROUP BY authors.au_id, authors.au_lname, authors.au_fname
ORDER BY TOTAL DESC;