[Gelormini Marcello lab-mysql-select]

your-code/solutions.sql

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+USE publications;
+
+# Challenge 1 - Who have published what at where?
+
+CREATE TABLE table_challenge1 AS
+SELECT joined_table2.au_id AS 'AUTHOR ID', joined_table2.au_lname AS 'LAST NAME', joined_table2.au_fname AS 'FIRST NAME', joined_table2.title AS 'TITLE', publishers.pub_name AS 'PUBLISHER'
+FROM
+  (SELECT joined_table1.au_id, joined_table1.au_lname, joined_table1.au_fname, titles.title, titles.pub_id
+    FROM
+      (SELECT authors.au_id, authors.au_lname, authors.au_fname, titleauthor.title_id
+        FROM authors
+        LEFT JOIN titleauthor ON authors.au_id = titleauthor.au_id
+      ) AS joined_table1
+    LEFT JOIN titles ON joined_table1.title_id = titles.title_id
+  ) AS joined_table2
+LEFT JOIN publishers ON joined_table2.pub_id = publishers.pub_id;
+
+SELECT * FROM table_challenge1;
+
+# Challenge 2 - Who Have Published How Many At Where?
+
+SELECT COUNT(*) AS total_records FROM titleauthor;
+
+SELECT `AUTHOR ID`, `LAST NAME`, `FIRST NAME`, `PUBLISHER`, COUNT(`TITLE`) AS `TITLE COUNT`
+FROM table_challenge1
+GROUP BY `AUTHOR ID`, `LAST NAME`, `FIRST NAME`, `PUBLISHER`;
+
+
+SELECT SUM(`TITLE COUNT`) AS TOTAL
+FROM (
+	SELECT `AUTHOR ID`, `LAST NAME`, `FIRST NAME`, `PUBLISHER`, COUNT(`TITLE`) AS `TITLE COUNT`
+	FROM table_challenge1
+	GROUP BY `AUTHOR ID`, `LAST NAME`, `FIRST NAME`, `PUBLISHER`
+    ) AS table_challenge2;
+
+# Challenge 3 - Best Selling Authors
+
+SELECT `AUTHOR ID`, `LAST NAME`, `FIRST NAME`, COUNT(`TITLE`) AS `TOTAL`
+FROM table_challenge1
+GROUP BY `AUTHOR ID`, `LAST NAME`, `FIRST NAME`
+ORDER BY `TOTAL` DESC
+LIMIT 3;
+
+
+# Challenge 4 - Best Selling Authors Ranking
+
+SELECT `AUTHOR ID`, `LAST NAME`, `FIRST NAME`, COUNT(`TITLE`) AS `TOTAL`
+FROM table_challenge1
+GROUP BY `AUTHOR ID`, `LAST NAME`, `FIRST NAME`
+ORDER BY `TOTAL` DESC;