[lab-mysql-select] Whitney Owusu-Ansah

your-code/solutions.sql

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+USE publications;
+SHOW TABLES;
+SELECT * FROM authors;
+SELECT * FROM publishers;
+
+## Challenge 1 - Who Have Published What At Where?
+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 -Who Have Published How Many At Where?
+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) 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, authors.au_lname, authors.au_fname, publishers.pub_name;
+
+#Challenge 3 Who are the top 3 authors who have sold the highest number of titles? 
+SELECT
+    authors.au_id AS 'AUTHOR ID',
+    authors.au_lname AS 'LAST NAME',
+    authors.au_fname AS 'FIRST NAME',
+    SUM(sales.qty) AS 'TOTAL'
+FROM
+    authors
+JOIN
+    titleauthor ON authors.au_id = titleauthor.au_id
+JOIN
+    titles ON titleauthor.title_id = titles.title_id
+LEFT JOIN
+    sales ON titles.title_id = sales.title_id
+GROUP BY
+    authors.au_id, authors.au_lname, authors.au_fname
+ORDER BY
+	TOTAL DESC
+LIMIT 3;
+
+#Challenge 4 - Best Selling Authors Ranking
+SELECT
+    authors.au_id AS 'AUTHOR ID',
+    authors.au_lname AS 'LAST NAME',
+    authors.au_fname AS 'FIRST NAME',
+    COALESCE(SUM(sales.qty), 0) AS 'TOTAL'
+FROM
+    authors
+LEFT JOIN
+    titleauthor ON authors.au_id = titleauthor.au_id
+LEFT JOIN
+    titles ON titleauthor.title_id = titles.title_id
+LEFT JOIN
+    sales ON titles.title_id = sales.title_id
+GROUP BY
+    authors.au_id, authors.au_lname, authors.au_fname
+ORDER BY
+    TOTAL DESC;
+