diff --git a/solutions.sql b/solutions.sql
new file mode 100644
index 0000000..381d80c
--- /dev/null
+++ b/solutions.sql
@@ -0,0 +1,53 @@
+USE publications;
+
+# Challenge 1: Who have published what at where
+
+SELECT authors.au_id, authors.au_lname AS last_name, authors.au_fname AS first_name, 
+titleauthor.title_id, titles.title, publishers.pub_name FROM authors
+LEFT JOIN titleauthor ON authors.au_id = titleauthor.au_id
+LEFT JOIN titles ON titleauthor.title_id = titles.title_id
+LEFT JOIN publishers ON titles.pub_id = publishers.pub_id
+WHERE titles.title IS NOT NULL;
+
+# Challenge 2: Who have published how many at where?
+
+SELECT authors.au_id, authors.au_lname AS last_name, authors.au_fname AS first_name, 
+COUNT(titleauthor.title_id), publishers.pub_name FROM authors
+LEFT JOIN titleauthor ON authors.au_id = titleauthor.au_id
+LEFT JOIN titles ON titleauthor.title_id = titles.title_id
+LEFT JOIN publishers ON titles.pub_id = publishers.pub_id
+WHERE titles.title IS NOT NULL
+GROUP BY authors.au_id, publishers.pub_name;
+
+# Challenge 3: Best selling authors
+
+SELECT authors.au_id, authors.au_lname, authors.au_fname, SUM(sales.qty) 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 titleauthor.title_id = sales.title_id
+GROUP BY au_lname, au_fname
+ORDER BY total DESC
+LIMIT 3;
+
+# Challenge 4: Best selling authors ranking
+
+SELECT authors.au_id, authors.au_lname, authors.au_fname, IFNULL(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 titleauthor.title_id = sales.title_id
+GROUP BY au_lname, au_fname
+ORDER BY total DESC;
+
+# Bonus challenge: Most profitable authors
+
+select titles.title_id, titles.title, titles.advance, titles.royalty, titles.advance * (titles.royalty/100) as advance_earnings, 
+titles.price, authors.au_id, authors.au_fname, authors.au_lname, titleauthor.royaltyper, sum(sales.qty) as total_sales, 
+(royalty/100) * price * sum(sales.qty) * (royaltyper/100) as royalty_earnings, 
+(titles.advance * (titles.royalty/100)) + ((royalty/100) * price * sum(sales.qty) * (royaltyper/100)) as total_earnings 
+from titles
+left join titleauthor on titles.title_id = titleauthor.title_id
+left join authors on titleauthor.au_id = authors.au_id
+left join sales on titles.title_id = sales.title_id
+where titles.price is not null
+group by titles.title_id, authors.au_id
+order by total_earnings desc;