diff --git a/SQL-intro_author b/SQL-intro_author
new file mode 100644
index 0000000..ced2b94
--- /dev/null
+++ b/SQL-intro_author
@@ -0,0 +1,47 @@
+CREATE TABLE books (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    author TEXT,
+    title TEXT,
+    words INTEGER);
+    
+INSERT INTO books (author, title, words)
+    VALUES ("J.K. Rowling", "Harry Potter and the Philosopher's Stone", 79944);
+INSERT INTO books (author, title, words)
+    VALUES ("J.K. Rowling", "Harry Potter and the Chamber of Secrets", 85141);
+INSERT INTO books (author, title, words)
+    VALUES ("J.K. Rowling", "Harry Potter and the Prisoner of Azkaban", 107253);
+INSERT INTO books (author, title, words)
+    VALUES ("J.K. Rowling", "Harry Potter and the Goblet of Fire", 190637);
+INSERT INTO books (author, title, words)
+    VALUES ("J.K. Rowling", "Harry Potter and the Order of the Phoenix", 257045);
+INSERT INTO books (author, title, words)
+    VALUES ("J.K. Rowling", "Harry Potter and the Half-Blood Prince", 168923);
+INSERT INTO books (author, title, words)
+    VALUES ("J.K. Rowling", "Harry Potter and the Deathly Hallows", 197651);
+
+INSERT INTO books (author, title, words)
+    VALUES ("Stephenie Meyer", "Twilight", 118501);
+INSERT INTO books (author, title, words)
+    VALUES ("Stephenie Meyer", "New Moon", 132807);
+INSERT INTO books (author, title, words)
+    VALUES ("Stephenie Meyer", "Eclipse", 147930);
+INSERT INTO books (author, title, words)
+    VALUES ("Stephenie Meyer", "Breaking Dawn", 192196);
+    
+INSERT INTO books (author, title, words)
+    VALUES ("J.R.R. Tolkien", "The Hobbit", 95022);
+INSERT INTO books (author, title, words)
+    VALUES ("J.R.R. Tolkien", "Fellowship of the Ring", 177227);
+INSERT INTO books (author, title, words)
+    VALUES ("J.R.R. Tolkien", "Two Towers", 143436);
+INSERT INTO books (author, title, words)
+    VALUES ("J.R.R. Tolkien", "Return of the King", 134462);
+    
+SELECT author,SUM(words) AS total_words FROM books 
+    GROUP BY author
+    HAVING total_words > 1000000;
+    
+SELECT author, AVG(words) AS avg_words FROM books
+    GROUP BY author
+    HAVING avg_words > 150000;
+