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