Зміст курсу
SQL Basics
SQL Basics
Grouping by multiple columns
Can we group observations based on multiple columns? For example, we can group all cars by year and engine size and find the most expensive within these.
To group by multiple columns use the same approach as for sorting by multiple columns: just put it within GROUP BY statement separated with a comma. The query for the example above will look like this:
SELECT year, enginesize, AVG(price) FROM audi_cars GROUP BY year, enginesize
Завдання
From the audi_cars table calculate the maximum, average, and minimum price for each model manufactured in different years.
Завдання
From the audi_cars table calculate the maximum, average, and minimum price for each model manufactured in different years.
Перейдіть на комп'ютер для реальної практикиПродовжуйте з того місця, де ви зупинились, використовуючи один з наведених нижче варіантівВсе було зрозуміло?
Grouping by multiple columns
Can we group observations based on multiple columns? For example, we can group all cars by year and engine size and find the most expensive within these.
To group by multiple columns use the same approach as for sorting by multiple columns: just put it within GROUP BY statement separated with a comma. The query for the example above will look like this:
SELECT year, enginesize, AVG(price) FROM audi_cars GROUP BY year, enginesize
Завдання
From the audi_cars table calculate the maximum, average, and minimum price for each model manufactured in different years.
Завдання
From the audi_cars table calculate the maximum, average, and minimum price for each model manufactured in different years.
Перейдіть на комп'ютер для реальної практикиПродовжуйте з того місця, де ви зупинились, використовуючи один з наведених нижче варіантівВсе було зрозуміло?
Grouping by multiple columns
Can we group observations based on multiple columns? For example, we can group all cars by year and engine size and find the most expensive within these.
To group by multiple columns use the same approach as for sorting by multiple columns: just put it within GROUP BY statement separated with a comma. The query for the example above will look like this:
SELECT year, enginesize, AVG(price) FROM audi_cars GROUP BY year, enginesize
Завдання
From the audi_cars table calculate the maximum, average, and minimum price for each model manufactured in different years.
Завдання
From the audi_cars table calculate the maximum, average, and minimum price for each model manufactured in different years.
Перейдіть на комп'ютер для реальної практикиПродовжуйте з того місця, де ви зупинились, використовуючи один з наведених нижче варіантівВсе було зрозуміло?
Can we group observations based on multiple columns? For example, we can group all cars by year and engine size and find the most expensive within these.
To group by multiple columns use the same approach as for sorting by multiple columns: just put it within GROUP BY statement separated with a comma. The query for the example above will look like this:
SELECT year, enginesize, AVG(price) FROM audi_cars GROUP BY year, enginesize
Завдання
From the audi_cars table calculate the maximum, average, and minimum price for each model manufactured in different years.
Перейдіть на комп'ютер для реальної практикиПродовжуйте з того місця, де ви зупинились, використовуючи один з наведених нижче варіантівПерейдіть на комп'ютер для реальної практикиПродовжуйте з того місця, де ви зупинились, використовуючи один з наведених нижче варіантів