Add files via upload

Solutions.sql

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+/*Challenge1*/
+SELECT 
+    titleauthor.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 titleauthor
+JOIN authors ON titleauthor.au_id = authors.au_id
+JOIN titles ON titleauthor.title_id = titles.title_id
+JOIN publishers ON titles.pub_id = publishers.pub_id;
+
+/*Challenge2*/
+SELECT 
+    ta.au_id AS "AUTHOR ID",
+    a.au_lname AS "LAST NAME",
+    a.au_fname AS "FIRST NAME",
+    p.pub_name AS "PUBLISHER",
+    COUNT(t.title_id) AS "TITLE COUNT"
+FROM titleauthor ta
+JOIN authors a ON ta.au_id = a.au_id
+JOIN titles t ON ta.title_id = t.title_id
+JOIN publishers p ON t.pub_id = p.pub_id
+GROUP BY ta.au_id, p.pub_name
+ORDER BY ta.au_id, p.pub_name;
+
+/*Challenge3*/
+SELECT 
+    ta.au_id AS "AUTHOR ID",
+    a.au_lname AS "LAST NAME",
+    a.au_fname AS "FIRST NAME",
+    SUM(t.ytd_sales) AS "TOTAL"
+FROM titleauthor ta
+JOIN authors a ON ta.au_id = a.au_id
+JOIN titles t ON ta.title_id = t.title_id
+GROUP BY ta.au_id
+ORDER BY TOTAL DESC
+LIMIT 3;
+
+/*Challenge4*/
+SELECT 
+    a.au_id AS "AUTHOR ID",
+    a.au_lname AS "LAST NAME",
+    a.au_fname AS "FIRST NAME",
+    COALESCE(SUM(t.ytd_sales), 0) AS "TOTAL"
+FROM authors a
+LEFT JOIN titleauthor ta ON a.au_id = ta.au_id
+LEFT JOIN titles t ON ta.title_id = t.title_id
+GROUP BY a.au_id
+ORDER BY TOTAL DESC;