dr0zd
70 lines
2.1 KiB
SQL
70 lines
2.1 KiB
SQL
--drop table is exists users;
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create table users(
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id int 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(50) not null,
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registration_date date not null default current_date
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)
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insert into users (id, name, age, email, registration_date) values
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(1, 'Alice', 25, 'alice@mail.com', '2023-01-10'),
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(2, 'Bob', 30, 'bob@gmail.com', '2023-02-05'),
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(3, 'Charlie',22, 'charlie@mail.com', '2023-02-20'),
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(4, 'Diana', 28, 'diana@mail.com', '2023-03-01'),
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(5, 'Ethan', 35, 'ethan@gmail.com', '2023-03-10')
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create table courses(
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id int primary key,
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title text not null,
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category varchar(30) not null,
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created_at date not null default current_date
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)
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insert into courses (id, title, category, created_at) values
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(1, 'SQL для начинающих', 'data', '2023-01-01'),
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(2, 'Python для анализа данных', 'programming', '2023-01-15'),
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(3, 'BI с нуля', 'business', '2023-03-01');
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create table lessons(
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id int primary key,
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course_id int references courses(id),
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title text not null,
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duration_min int
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)
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insert into lessons (id, course_id, title, duration_min) values
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(1, 1, 'SELECT и FROM', 10),
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(2, 1, 'JOIN', 15),
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(3, 2, 'Pandas', 20),
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(4, 3, 'Основы BI', 12),
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(5, 3, 'Метрики и дашборды', 18)
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create table enrollments(
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id int 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 default current_date
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)
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insert into enrollments (id, user_id, course_id, enrolled_at) values
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(1, 1, 1, '2023-01-15'),
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(2, 1, 2, '2023-02-01'),
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(3, 2, 1, '2023-01-20'),
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(4, 3, 2, '2023-03-05'),
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(5, 4, 3, '2023-04-01')
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create table lessons_views(
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id int 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 not null default now()
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)
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insert into lessons_views(id, user_id, lesson_id, viewed_at) values
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(1, 1, 1, '2023-01-16 10:00:00'),
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(2, 1, 2, '2023-01-16 10:15:00'),
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(3, 2, 1, '2023-01-21 09:00:00'),
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(4, 3, 3, '2023-03-06 12:00:00'),
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(5, 4, 4, '2023-04-02 10:00:00'),
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(6, 4, 5, '2023-04-03 10:00:00') |