Add dml.sql and fix ddl.sql

SQL/ddl.sql

@@ -8,7 +8,7 @@ create table akalyanov.users (
     is_active boolean,
     created_at timestamp not null
 );
--- Таблица товаров
+-- Таблица продуктов
 create table akalyanov.products (
     id int primary key,
     name varchar(100) not null,
@@ -20,7 +20,7 @@ create table akalyanov.products (
 create table akalyanov.orders (
     id int primary key,
     user_id int,
-    order_date date not null,
+    order_date timestamptz not null,
     status varchar(20),
     foreign key (user_id) references akalyanov.users(id)
 );
@@ -30,5 +30,7 @@ create table akalyanov.order_items (
     product_id int,
     quantity smallint not null,
     price_at_purchase decimal(10,2) not null,
-    primary key (order_id, product_id)
+    primary key (order_id, product_id),
+    foreign key (order_id) references akalyanov.orders(id),
+    foreign key (product_id) references akalyanov.products(id)
 );

SQL/dml.sql

@@ -0,0 +1,46 @@
+-- Добавление пользователей в таблицу users
+insert into akalyanov.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');
+
+-- Добавление товаров в таблицу products
+insert into akalyanov.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);
+
+-- Добавление заказов в таблицу orders
+insert into akalyanov.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');
+
+-- Добавление товаров в таблицу order_items
+insert into akalyanov.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);