From 3fc5535e1de060011a92f8d0e64ffada13b32eb4 Mon Sep 17 00:00:00 2001
From: George <theboure@gmail.com>
Date: Thu, 11 Dec 2025 17:59:31 +0300
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---
 gmokrousov/postgresql/creating_tables.sql | 69 +++++++++++++++++++++++
 1 file changed, 69 insertions(+)
 create mode 100644 gmokrousov/postgresql/creating_tables.sql

diff --git a/gmokrousov/postgresql/creating_tables.sql b/gmokrousov/postgresql/creating_tables.sql
new file mode 100644
index 0000000..cc3c095
--- /dev/null
+++ b/gmokrousov/postgresql/creating_tables.sql
@@ -0,0 +1,69 @@
+create table users (
+    id serial primary key,
+    name varchar(50) not null,
+    age int not null,
+    email varchar(100) not null,
+    registration_date date not null
+);
+
+insert into users (name, age, email, registration_date) values
+    ('Alice', 25, 'alice@mail.com', ; '2023-01-10'),
+    ('Bob', 30, 'bob@gmail.com', '2023-02-05'),
+    ('Charlie', 22, 'Charlie@mail.com', '2023-02-20'),
+    ('Diana', 28, 'diana@mail.com', '2023-03-01'),
+    ('Ethan', 35, 'ethan@gmail.com', '2023-03-10');
+
+create table courses (
+    id serial primary key,
+    title varchar(100) not null,
+    category varchar(30) not null,
+    created_at date not_null
+);
+
+insert into courses (title, category, created_at) values
+    ('SQL для начинающих', 'data', '2023-01-01'),
+    ('Python для анализа данных', 'programming', '2023-01-15'),
+    ('BI с нуля', 'business', '2023-03-01');
+
+create table lessons (
+    id serial primary key,
+    course_id int references courses(id),
+    title varchar(100) not null,
+    duration_min int not null
+);
+
+insert into lessons (course_id, title, duration_min) values
+    (1, 'SELECT и FROM', 10),
+    (1, 'JOIN', 15),
+    (2, 'Pandas', 20),
+    (3, 'Основы BI', 12),
+    (3, 'Метрики и дашборды', 18);
+
+create table enrollments (
+    id serial primary key,
+    user_id int references users(id),
+    course_id int references courses(id),
+    enrolled_at date not null
+);
+
+insert into enrollments (user_id, course_id, enrolled_at) values
+    (1, 1, '2023-01-15'),
+    (1, 2, '2023-02-01'),
+    (2, 1, '2023-01-20'),
+    (3, 2, '2023-03-05'),
+    (4, 3, '2023-04-01');
+
+create table lesson_views (
+    id serial primary key,
+    user_id int references users(id),
+    lesson_id int references lessons(id),
+    viewed_at timestamp(0) not null
+);
+
+insert into lesson_views (user_id, lesson_id, viewed_at) values
+    (1, 1, '2023-01-16 10:00:00'),
+    (1, 2, '2023-01-16 10:15:00'),
+    (2, 1, '2023-01-21 09:00:00'),
+    (3, 3, '2023-03-06 12:00:00'),
+    (4, 4, '2023-04-02 10:00:00'),
+    (4, 5, '2023-04-03 10:00:00');