From 6b950437280a938880d2b139b44ef946b1c96b5c Mon Sep 17 00:00:00 2001
From: Sanober Khoso <sanober1979@gmail.com>
Date: Sat, 25 Nov 2023 22:47:46 +0100
Subject: [PATCH] SanoberKhoso

---
 your-code/solutions.sql | 97 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 97 insertions(+)
 create mode 100644 your-code/solutions.sql

diff --git a/your-code/solutions.sql b/your-code/solutions.sql
new file mode 100644
index 0000000..273f1d3
--- /dev/null
+++ b/your-code/solutions.sql
@@ -0,0 +1,97 @@
+-- Challenge 1 -------------------------
+
+USE publications;
+
+SELECT 
+    authors.au_id AS `Author Id`,
+    au_lname AS `Last Name`,
+    au_fname AS `First Name`,
+    titles.title AS `Title`,
+    pub_name AS `Publisher`
+FROM
+    authors
+        INNER JOIN
+    titleauthor ON authors.au_id = titleauthor.au_id
+        INNER JOIN
+    titles ON titleauthor.title_id = titles.title_id
+        INNER JOIN
+    publishers ON titles.pub_id = publishers.pub_id
+
+
+-- Challenge 2 - Solution 1 ----------------------------
+USE publications;
+
+SELECT 
+    authors.au_id AS `Author Id`,
+    au_lname AS `Last Name`,
+    au_fname AS `First Name`,
+    pub_name AS `Publisher`,
+    COUNT(titles.title_id) AS `Title Count`
+FROM
+    authors
+        INNER JOIN
+    titleauthor ON authors.au_id = titleauthor.au_id
+        INNER JOIN
+    titles ON titleauthor.title_id = titles.title_id
+        INNER JOIN
+    publishers ON titles.pub_id = publishers.pub_id
+GROUP BY authors.au_id , au_lname , au_fname , pub_name
+
+
+-- Challenge 2 - Solution 2 using subquery --------
+USE publications;
+
+SELECT 
+    `Author Id`,
+    `Last Name`,
+    `First Name`,
+    `Publisher`,
+    COUNT(`Title`) AS `Title Count`
+FROM
+    (SELECT 
+        authors.au_id AS `Author Id`,
+            au_lname AS `Last Name`,
+            au_fname AS `First Name`,
+            titles.title AS `Title`,
+            pub_name AS `Publisher`
+    FROM
+        authors
+    INNER JOIN titleauthor ON authors.au_id = titleauthor.au_id
+    INNER JOIN titles ON titleauthor.title_id = titles.title_id
+    INNER JOIN publishers ON titles.pub_id = publishers.pub_id) t
+GROUP BY `Author Id` , `Last Name` , `First Name` , `Publisher`
+
+-- Challenge 3 -----------
+USE publications;
+
+SELECT 
+    authors.au_id AS `Author Id`,
+    au_lname AS `Last Name`,
+    au_fname AS `First Name`,
+    SUM(qty) AS `Total`
+FROM
+    authors
+        INNER JOIN
+    titleauthor ON authors.au_id = titleauthor.au_id
+        INNER JOIN
+    sales ON titleauthor.title_id = sales.title_id
+GROUP BY authors.au_id , au_lname , au_fname
+ORDER BY `Total` DESC
+LIMIT 3
+
+-- Challenge 4 -----------------
+USE publications;
+
+SELECT 
+    authors.au_id AS `Author Id`,
+    au_lname AS `Last Name`,
+    au_fname AS `First Name`,
+    IFNULL(SUM(qty), 0) AS `Total`
+FROM
+    authors
+        LEFT JOIN
+    titleauthor ON authors.au_id = titleauthor.au_id
+        LEFT JOIN
+    sales ON titleauthor.title_id = sales.title_id
+GROUP BY authors.au_id , au_lname , au_fname
+ORDER BY `Total` DESC