Done

2026-01-10 20:11:38 +06:00
parent 717ba15e01
commit 47732aa19a
2 changed files with 217 additions and 1 deletions
@@ -0,0 +1,217 @@
+CREATE TABLE IF NOT EXISTS amaksatov.users (
+    id SERIAL PRIMARY KEY,
+    name VARCHAR(100),
+    age INT,
+    email VARCHAR(255),
+    registration_date DATE
+);
+
+CREATE TABLE IF NOT EXISTS amaksatov.courses (
+    id SERIAL PRIMARY KEY,
+    title VARCHAR(255),
+    category VARCHAR(100),
+    created_at DATE
+);
+
+CREATE TABLE IF NOT EXISTS amaksatov.lessons (
+    id SERIAL PRIMARY KEY,
+    course_id INT,
+    title VARCHAR(255),
+    duration_min INT,
+    FOREIGN KEY (course_id) REFERENCES amaksatov.courses(id)
+);
+
+CREATE TABLE IF NOT EXISTS amaksatov.enrollments (
+    id SERIAL PRIMARY KEY,
+    user_id INT,
+    course_id INT,
+    enrolled_at date,
+    FOREIGN KEY (user_id) REFERENCES amaksatov.users(id),
+    FOREIGN KEY (course_id) REFERENCES amaksatov.courses(id)
+);
+
+CREATE TABLE IF NOT EXISTS amaksatov.lesson_views (
+    id SERIAL PRIMARY KEY,
+    user_id INT,
+    lesson_id INT,
+    viewed_at TIMESTAMP,
+    FOREIGN KEY (user_id) REFERENCES amaksatov.users(id),
+    FOREIGN KEY (lesson_id) REFERENCES amaksatov.lessons(id)
+);
+
+
+INSERT
+    INTO
+    amaksatov.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'
+);
+
+SELECT * FROM amaksatov.users;
+
+
+INSERT
+    INTO
+    amaksatov.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'
+);
+
+INSERT
+    INTO
+    amaksatov.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
+);
+
+INSERT
+    INTO
+    amaksatov.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'
+);
+
+INSERT
+    INTO
+    amaksatov.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'
+);
+
+
+SELECT * FROM amaksatov.lessons