added 3 and 4

film_queries.sql

@@ -28,4 +28,36 @@ ORDER BY last_name, first_name;
 
 --2d
 SELECT country_id, country FROM country
-WHERE country IN ("Afghanistan", "Bangladesh", "China");
+WHERE country IN ("Afghanistan", "Bangladesh", "China");
+
+--3a
+ALTER TABLE actor
+ADD COLUMN middle_name VARCHAR(45) AFTER first_name;
+
+--3b
+ALTER TABLE actor
+MODIFY COLUMN middle_name blob;
+
+--3b
+ALTER TABLE actor
+DROP COLUMN middle_name;
+
+--4a
+SELECT last_name FROM actor;
+
+--4b
+SELECT last_name, COUNT(*) FROM actor 
+GROUP BY last_name;
+
+--4c
+ SELECT last_name, COUNT(*) as count FROM actor 
+ GROUP BY last_name 
+ HAVING count > 1;
+
+ --4d
+SELECT * FROM actor 
+WHERE last_name LIKE 'Williams';
+
+UPDATE actor
+SET first_name = 'HARPO'
+WHERE actor_id = 172;