diff --git a/.DS_Store b/.DS_Store
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Binary files /dev/null and b/.DS_Store differ
diff --git a/your-code/solutions.sql b/your-code/solutions.sql
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+++ b/your-code/solutions.sql
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+USE publications;
+
+-- 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
+INNER JOIN titleauthor ON authors.au_id = titleauthor.au_id
+INNER JOIN titles USING (title_id)
+INNER JOIN publishers USING (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', COUNT(titles.title) AS 'TITLE COUNT', publishers.pub_name AS 'PUBLISHER'
+FROM authors
+INNER JOIN titleauthor ON authors.au_id = titleauthor.au_id
+INNER JOIN titles USING (title_id)
+INNER JOIN publishers USING (pub_id)
+GROUP BY authors.au_id,publishers.pub_name;
+
+-- Challenge 3 - Best Selling Authors
+
+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
+INNER JOIN titleauthor ON authors.au_id = titleauthor.au_id
+INNER JOIN titles USING (title_id)
+INNER JOIN sales USING (title_id)
+GROUP BY authors.au_id
+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', IFNULL(SUM(sales.qty), 0) AS 'TOTAL'
+FROM authors
+LEFT JOIN titleauthor ON authors.au_id = titleauthor.au_id
+LEFT JOIN titles USING (title_id)
+LEFT JOIN sales USING (title_id)
+GROUP BY authors.au_id
+ORDER BY TOTAL DESC;