[lab-mysql-select]GuadalupeSolis

your-code/solutions.sql

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+USE pubs;
+
+-- Challenge 1 - Who Have Published What At Where?
+
+SELECT 
+    au.au_id AS 'AUTHOR ID',
+    CONCAT(au.au_lname, ', ', au.au_fname) AS 'AUTHOR NAME',
+    tt.title AS 'TITLE',
+    pb.pub_name AS 'PUBLISHER',
+    DATE(tt.pubdate) AS 'PUBLICATION DATE'
+FROM 
+    authors au
+JOIN 
+    titleauthor ta ON ta.au_id = au.au_id
+JOIN 
+    titles tt ON tt.title_id = ta.title_id
+JOIN 
+    publishers pb ON pb.pub_id = tt.pub_id;
+
+-- Challenge 2 - Who Have Published How Many At Where?
+
+SELECT 
+    au.au_id AS 'AUTHOR ID',
+    au.au_lname AS 'LAST NAME',
+    au.au_fname AS 'FIRST NAME',
+    pb.pub_name AS 'PUBLISHER',
+    COUNT(tt.title_id) AS 'TITLE COUNT'
+FROM 
+    authors au
+JOIN 
+    titleauthor ta ON ta.au_id = au.au_id
+JOIN 
+    titles tt ON tt.title_id = ta.title_id 
+JOIN 
+    publishers pb ON pb.pub_id = tt.pub_id
+GROUP BY
+	au.au_id, au.au_lname, au.au_fname, pb.pub_name;
+
+-- Challenge 3 - Best Selling Authors
+SELECT
+	au.au_id AS 'AUTHOR ID',
+    au.au_lname AS 'LAST NAME',
+    au.au_fname AS 'FIRST NAME',
+    SUM(ss.qty) AS 'TOTAL'
+FROM 
+    authors au
+JOIN 
+    titleauthor ta ON ta.au_id = au.au_id
+JOIN 
+    sales ss ON ss.title_id = ta.title_id
+GROUP BY
+	au.au_id, au.au_lname, au.au_fname
+ORDER BY 
+	TOTAL DESC
+LIMIT 3;
+
+-- Challenge 4 - Best Selling Authors Ranking
+SELECT
+	au.au_id AS 'AUTHOR ID',
+    au.au_lname AS 'LAST NAME',
+    au.au_fname AS 'FIRST NAME',
+    IFNULL(SUM(ss.qty), 0) AS 'TOTAL'
+FROM 
+    authors au
+LEFT JOIN 
+    titleauthor ta ON ta.au_id = au.au_id
+LEFT JOIN 
+    sales ss ON ss.title_id = ta.title_id
+GROUP BY
+	au.au_id, au.au_lname, au.au_fname
+ORDER BY 
+	TOTAL DESC;