DML для пет 'Пет-проект: Онлайн-курсы'
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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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('Frank',29,'frank@mail.com','2023-01-05'),
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('Grace',26,'grace@gmail.com','2023-01-12'),
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('Henry',32,'henry@mail.com','2023-01-20'),
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('Iris',24,'iris@gmail.com','2023-02-10'),
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('Jack',27,'jack@mail.com','2023-04-15'),
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('Kelly',23,'kelly@gmail.com','2023-04-20'),
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('Leo',31,'leo@mail.com','2023-01-15'),
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('Mia',26,'mia@gmail.com','2023-01-18'),
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('Nina',28,'nina@mail.com','2023-01-08'),
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('Oscar',33,'oscar@gmail.com','2023-01-10'),
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('Paul',29,'paul@mail.com','2023-02-15'),
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('Quinn',24,'quinn@gmail.com','2023-03-20'),
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('Rita',27,'rita@mail.com','2023-04-01'),
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('Sam',30,'sam@gmail.com','2023-04-10'),
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('Tina',25,'tina@mail.com','2023-04-18');
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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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('Excel для аналитиков','business','2023-02-01'),
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('Основы машинного обучения','data','2023-03-15');
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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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(1,'WHERE и фильтрация',12),
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(1,'Агрегации и GROUP BY',18),
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(1,'Подзапросы',25),
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(2,'Pandas основы',20),
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(2,'NumPy',15),
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(2,'Визуализация данных',22),
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(3,'Основы BI',12),
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(3,'Метрики и дашборды',18),
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(3,'Power BI введение',20),
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(4,'Формулы в Excel',15),
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(4,'Сводные таблицы',18),
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(4,'Графики и диаграммы',14),
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(5,'Введение в ML',20),
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(5,'Линейная регрессия',30),
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(5,'Классификация',28),
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(5,'Кластеризация',25);
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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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(6,1,'2023-01-06'),
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(6,2,'2023-01-10'),
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(6,4,'2023-02-05'),
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(7,1,'2023-01-13'),
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(7,3,'2023-03-10'),
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(8,1,'2023-01-22'),
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(8,2,'2023-01-22'),
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(8,3,'2023-01-22'),
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(9,4,'2023-02-12'),
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(10,1,'2023-04-16'),
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(11,2,'2023-04-21'),
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(12,1,'2023-01-16'),
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(13,2,'2023-01-19'),
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(13,4,'2023-02-20'),
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(14,1,'2023-01-09'),
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(14,2,'2023-01-09'),
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(14,3,'2023-01-09'),
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(14,4,'2023-02-01'),
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(14,5,'2023-03-20'),
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(15,1,'2023-01-11'),
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(15,3,'2023-03-05'),
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(16,2,'2023-02-16'),
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(16,4,'2023-02-16'),
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(17,3,'2023-03-22'),
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(17,5,'2023-03-25'),
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(18,1,'2023-04-02'),
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(19,1,'2023-04-11'),
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(19,2,'2023-04-11'),
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(20,2,'2023-04-19'),
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(5,5,'2023-03-20'),
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(1,4,'2023-02-10'),
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(2,3,'2023-03-15'),
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(3,1,'2023-02-25'),
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(4,2,'2023-03-10'),
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(6,3,'2023-03-08'),
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(7,2,'2023-02-01'),
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(9,1,'2023-02-15'),
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(12,3,'2023-03-10'),
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(15,2,'2023-02-01'),
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(18,4,'2023-04-05');
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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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(1,3,'2023-01-17 09:00:00'),
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(1,4,'2023-01-17 09:30:00'),
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(1,4,'2023-01-17 11:00:00'),
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(1,4,'2023-01-18 10:00:00'),
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(1,6,'2023-02-02 14:00:00'),
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(1,12,'2023-02-15 10:00:00'),
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(1,13,'2023-02-15 10:30:00'),
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(2,1,'2023-01-21 09:00:00'),
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(2,9,'2023-03-16 10:00:00'),
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(2,10,'2023-03-16 10:30:00'),
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(3,6,'2023-03-06 12:00:00'),
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(3,1,'2023-02-26 11:00:00'),
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(3,2,'2023-02-26 11:20:00'),
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(4,9,'2023-04-02 10:00:00'),
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(4,10,'2023-04-03 10:00:00'),
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(4,6,'2023-03-12 14:00:00'),
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(4,7,'2023-03-13 09:00:00'),
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(5,15,'2023-03-21 10:00:00'),
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(5,16,'2023-03-22 11:00:00'),
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(6,1,'2023-01-07 10:00:00'),
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(6,2,'2023-01-07 10:15:00'),
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(6,3,'2023-01-08 09:00:00'),
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(6,4,'2023-01-08 09:30:00'),
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(6,5,'2023-01-09 10:00:00'),
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(6,6,'2023-01-11 14:00:00'),
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(6,7,'2023-01-12 10:00:00'),
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(6,8,'2023-01-13 11:00:00'),
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(6,12,'2023-02-06 09:00:00'),
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(6,13,'2023-02-06 09:30:00'),
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(6,14,'2023-02-07 10:00:00'),
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(6,9,'2023-03-09 11:00:00'),
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(7,1,'2023-01-14 10:00:00'),
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(7,2,'2023-01-14 10:20:00'),
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(7,3,'2023-01-15 09:00:00'),
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(7,9,'2023-03-11 14:00:00'),
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(7,10,'2023-03-11 14:30:00'),
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(9,12,'2023-02-13 10:00:00'),
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(9,13,'2023-02-13 10:30:00'),
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(9,1,'2023-02-16 11:00:00'),
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(12,1,'2023-01-17 10:00:00'),
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(12,2,'2023-01-17 10:20:00'),
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(12,1,'2023-04-10 11:00:00'),
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(12,3,'2023-04-10 11:30:00'),
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(12,9,'2023-03-12 10:00:00'),
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(13,6,'2023-01-20 14:00:00'),
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(13,7,'2023-01-21 10:00:00'),
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(13,12,'2023-02-21 09:00:00'),
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(14,1,'2023-01-09 08:00:00'),
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(14,2,'2023-01-09 08:15:00'),
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(14,3,'2023-01-10 10:00:00'),
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(14,4,'2023-01-10 10:30:00'),
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(14,5,'2023-01-11 09:00:00'),
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(14,6,'2023-01-10 14:00:00'),
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(14,7,'2023-01-11 10:00:00'),
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(14,8,'2023-01-12 11:00:00'),
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(14,9,'2023-01-10 08:00:00');
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