my solutions

solutions.sql

@@ -0,0 +1,31 @@
+SELECT a.au_id AS "AUTHOR ID", a.au_lname AS "LAST NAME", a.au_fname AS "FIRST NAME", t.title AS TITLE, p.pub_name AS PUBLISHER
+FROM authors AS a
+JOIN titleauthor AS ta ON a.au_id = ta.au_id
+JOIN titles AS t ON ta.title_id = t.title_id
+JOIN publishers AS p ON p.pub_id = t.pub_id;
+
+
+SELECT a.au_id AS "AUTHOR ID", a.au_lname AS "LAST NAME", a.au_fname AS "FIRST NAME", p.pub_name AS PUBLISHER, COUNT(*)
+FROM authors AS a
+JOIN titleauthor AS ta ON a.au_id = ta.au_id
+JOIN titles AS t ON ta.title_id = t.title_id
+JOIN publishers AS p ON p.pub_id = t.pub_id
+GROUP BY a.au_id, p.pub_id
+ORDER BY a.au_id DESC;
+
+SELECT a.au_id AS "AUTHOR ID", a.au_lname AS "LAST NAME", a.au_fname AS "FIRST NAME", SUM(sales.qty) AS "TOTAL"
+FROM authors AS a
+JOIN titleauthor AS ta ON a.au_id = ta.au_id
+JOIN titles AS t ON ta.title_id = t.title_id
+JOIN sales ON sales.title_id = t.title_id
+GROUP by a.au_id
+ORDER BY "TOTAL" DESC
+LIMIT 3;
+
+SELECT a.au_id AS "AUTHOR ID", a.au_lname AS "LAST NAME", a.au_fname AS "FIRST NAME", COALESCE(SUM(sales.qty), 0) AS "TOTAL"
+FROM authors AS a
+LEFT JOIN titleauthor AS ta ON a.au_id = ta.au_id
+LEFT JOIN titles AS t ON ta.title_id = t.title_id
+LEFT JOIN sales ON sales.title_id = t.title_id
+GROUP by a.au_id, a.au_lname, a.au_fname
+ORDER BY "TOTAL" DESC