diff --git a/.idea/.gitignore b/.idea/.gitignore
new file mode 100644
index 0000000..26d3352
--- /dev/null
+++ b/.idea/.gitignore
@@ -0,0 +1,3 @@
+# Default ignored files
+/shelf/
+/workspace.xml
diff --git a/.idea/api-sql-intro.iml b/.idea/api-sql-intro.iml
new file mode 100644
index 0000000..d6ebd48
--- /dev/null
+++ b/.idea/api-sql-intro.iml
@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$" />
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
new file mode 100644
index 0000000..37813b7
--- /dev/null
+++ b/.idea/misc.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_21" default="true" project-jdk-name="ms-21" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/out" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/modules.xml b/.idea/modules.xml
new file mode 100644
index 0000000..3f39777
--- /dev/null
+++ b/.idea/modules.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/.idea/api-sql-intro.iml" filepath="$PROJECT_DIR$/.idea/api-sql-intro.iml" />
+    </modules>
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/vcs.xml b/.idea/vcs.xml
new file mode 100644
index 0000000..35eb1dd
--- /dev/null
+++ b/.idea/vcs.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="" vcs="Git" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/sql/products/core.sql b/sql/products/core.sql
new file mode 100644
index 0000000..2a5944d
--- /dev/null
+++ b/sql/products/core.sql
@@ -0,0 +1,51 @@
+CREATE TABLE films (
+    id SERIAL PRIMARY KEY,
+    title VARCHAR(50) UNIQUE NOT NULL,
+    genre VARCHAR(50) NOT NULL,
+    release_year INT NOT NULL,
+    score INT CHECK (score BETWEEN 0 AND 10)
+);
+
+INSERT INTO films (title, genre, release_year, score) VALUES
+('The Shawshank Redemption', 'Drama', 1994, 9),
+('The Godfather', 'Crime', 1972, 9),
+('The Dark Knight', 'Action', 2008, 9),
+('Alien', 'SciFi', 1979, 9),
+('Total Recall', 'SciFi', 1990, 8),
+('The Matrix', 'SciFi', 1999, 8),
+('The Matrix Resurrections', 'SciFi', 2021, 5),
+('The Matrix Reloaded', 'SciFi', 2003, 6),
+('The Hunt for Red October', 'Thriller', 1990, 7),
+('Misery', 'Thriller', 1990, 7),
+('The Power Of The Dog', 'Western', 2021, 6),
+('Hell or High Water', 'Western', 2016, 8),
+('The Good the Bad and the Ugly', 'Western', 1966, 9),
+('Unforgiven', 'Western', 1992, 7);
+
+SELECT * FROM films;
+
+SELECT * FROM films ORDER BY SCORE DESC
+
+SELECT * FROM films ORDER BY release_year ASC
+
+SELECT * FROM films WHERE score >= 8
+
+SELECT * FROM films WHERE score <=7
+
+SELECT * FROM films WHERE release_year=1990
+
+SELECT * FROM films WHERE release_year < 2000
+
+SELECT * FROM films WHERE release_year > 1990
+
+SELECT * FROM films WHERE release_year > 1990 and release_year < 1999
+
+SELECT * FROM films WHERE genre = 'SciFi'
+
+SELECT * FROM films WHERE genre = 'SciFi' OR genre = 'Western'
+
+SELECT * FROM films WHERE genre <> 'SciFi'
+
+SELECT * FROM films WHERE genre = 'Western' AND release_year < 2000
+
+SELECT * FROM films WHERE title LIKE '%Matrix%'
\ No newline at end of file
diff --git a/sql/products/extension1.sql b/sql/products/extension1.sql
new file mode 100644
index 0000000..769ff7a
--- /dev/null
+++ b/sql/products/extension1.sql
@@ -0,0 +1,5 @@
+SELECT AVG(score) FROM films
+
+SELECT COUNT(*) FROM films
+
+SELECT AVG(score), genre FROM films GROUP BY genre
\ No newline at end of file
diff --git a/sql/products/extension2.sql b/sql/products/extension2.sql
new file mode 100644
index 0000000..6ece84a
--- /dev/null
+++ b/sql/products/extension2.sql
@@ -0,0 +1,42 @@
+CREATE TABLE IF NOT EXISTS directors(
+	id SERIAL PRIMARY KEY,
+  name TEXT NOT NULL
+);
+
+INSERT INTO directors (name) VALUES
+('Steven Spielberg'),
+('Christopher Nolan'),
+('Martin Scorsese'),
+('Quentin Tarantino'),
+('Jon Favreau'),
+('Woody Allen'),
+('Peter Jackson');
+
+DROP TABLE films
+
+CREATE TABLE films (
+    id SERIAL PRIMARY KEY,
+    title VARCHAR(50) UNIQUE NOT NULL,
+    genre VARCHAR(50) NOT NULL,
+    release_year INT NOT NULL,
+    score INT CHECK (score BETWEEN 0 AND 10),
+  	director_id INT
+);
+
+INSERT INTO films (title, genre, release_year, score, director_id) VALUES
+('The Shawshank Redemption', 'Drama', 1994, 9, 1),
+('The Godfather', 'Crime', 1972, 9, 2),
+('The Dark Knight', 'Action', 2008, 9, 3),
+('Alien', 'SciFi', 1979, 9, 4),
+('Total Recall', 'SciFi', 1990, 8, 5),
+('The Matrix', 'SciFi', 1999, 8, 6),
+('The Matrix Resurrections', 'SciFi', 2021, 5, 7),
+('The Matrix Reloaded', 'SciFi', 2003, 6,1),
+('The Hunt for Red October', 'Thriller', 1990, 7,2),
+('Misery', 'Thriller', 1990, 7,3),
+('The Power Of The Dog', 'Western', 2021, 6,4),
+('Hell or High Water', 'Western', 2016, 8,5),
+('The Good the Bad and the Ugly', 'Western', 1966, 9,6),
+('Unforgiven', 'Western', 1992, 7,7);
+
+SELECT * FROM films INNER JOIN directors ON films.director_id = directors.id;
\ No newline at end of file
diff --git a/sql/products/extension3.sql b/sql/products/extension3.sql
new file mode 100644
index 0000000..7fda7a4
--- /dev/null
+++ b/sql/products/extension3.sql
@@ -0,0 +1 @@
+SELECT name, COUNT(films.id) FROM directors LEFT JOIN films ON films.director_id = directors.id GROUP BY name
\ No newline at end of file