add DDL DML

dmedvedev/ddl.sql

@@ -0,0 +1,32 @@
+CREATE TABLE users (
+  id INT PRIMARY KEY NOT NULL,
+  name VARCHAR(100) NOT NULL,
+  age INT,
+  email VARCHAR(100),
+  country VARCHAR(2),
+  is_active BOOLEAN DEFAULT true,
+  created_at TIMESTAMPTZ NOT NULL
+);
+
+CREATE TABLE products (
+  id INT PRIMARY KEY NOT NULL,
+  name VARCHAR(100) NOT NULL,
+  category VARCHAR(50),
+  price DECIMAL(10,2) NOT NULL,
+  in_stock BOOLEAN
+);
+
+CREATE TABLE orders (
+  id INT PRIMARY KEY NOT NULL,
+  user_id INT,
+  order_date TIMESTAMPTZ NOT NULL,
+  status VARCHAR(20) 
+);
+
+CREATE TABLE order_items (
+  order_id INT NOT NULL,
+  product_id INT NOT NULL,
+  quantity INT NOT NULL,
+  price_at_purchase DECIMAL(10,2) NOT NULL,
+  PRIMARY_KEY (order_id, product_id)
+);

dmedvedev/dmedvedev/postgresql/script.sql

@@ -1 +0,0 @@
-select * from test3;

dmedvedev/dml.sql

@@ -0,0 +1,42 @@
+INSERT INTO users(id, name, age, email, country, is_active, created_at)
+VALUES  (1,	'Alice',	25,	'alice@example.com',	'US',	TRUE,	'2024-01-10 10:00:00'),
+        (2,	'Bob',	30,	'bob@example.com',	'UK',	TRUE,	'2024-02-05 09:30:00'),
+        (3,	'Carol',	27,	'carol@example.com',	'US',	FALSE,	'2024-03-01 15:20:00'),
+        (4,	'Diana',	22,	'diana@GMAIL.com',	'US',	TRUE,	'2024-01-12 08:15:00'),
+        (5,	'Evan',	35,	'EVAN@example.com',	'UK',	TRUE,	'2024-01-18 19:40:00'),
+        (6,	'Farida',	29,	'farida@example.com',	'KZ',	TRUE,	'2024-02-20 11:05:00'),
+        (7,	'George',	31,	'george+test@example.com',	'US',	TRUE,	'2024-03-05 16:45:00'),
+        (8,	'Helen',	24,	NULL,	'UK',	FALSE,	'2024-03-06 08:20:00'),
+        (9,	'Ivan',	26,	'ivan@example.com',	'RU',	TRUE,	'2024-01-11 14:30:00'),
+        (10,	'Julia',	28,	'julia@example.com',	'US',	TRUE,	'2024-03-07 18:05:00');
+
+INSERT INTO products(id, name, category, price, in_stock) 
+VALUES 	(1,	'iPhone 15',	'Электроника',	80000,	TRUE),
+		(2,	'Kindle',	'Электроника',	15000,	TRUE),
+		(3,	'Кроссовки Nike',	'Одежда',	9000,	TRUE),
+		(4,	'Кроссовки NoName',	'Одежда',	3000,	FALSE),
+		(5,	'Наушники Pro',	'Электроника',	12000,	TRUE),
+		(6,	'Фитнес‑браслет',	'Гаджеты',	6000,	TRUE),
+		(7,	'Подарочная карта',	'Сервисы',	1000,	TRUE);
+
+INSERT INTO orders(id, user_id, order_date, status) 
+VALUES 	(1,	1,	'2025-01-10 12:00:00',	'paid'),
+		(2,	3,	'2025-01-12 09:30:00',	'cancelled'),
+		(3,	1,	'2025-01-15 18:20:00',	'paid'),
+		(4,	2,	'2025-01-20 11:05:00',	'created'),
+		(5,	4,	'2025-02-01 17:45:00',	'paid'),
+		(6,	5,	'2025-02-10 10:10:00',	'refunded'),
+		(7,	7,	'2025-03-01 09:00:00',	'paid'),
+		(8,	9,	'2025-03-05 19:30:00',	'paid');
+
+INSERT INTO order_items(order_id, product_id, quantity, price_at_purchase) 
+VALUES 	(1,	1,	1,	78000),
+		(1,	3,	2,	8500),
+		(2,	2,	1,	14000),
+		(3,	5,	1,	11000),
+		(3,	7,	1,	1000),
+		(4,	2,	1,	15000),
+		(5,	6,	1,	6000),
+		(6,	1,	1,	82000),
+		(7,	3,	1,	9000),
+		(8,	4,	2,	2800)