Cursusinhoud
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
Swipe to start coding
From the audi_cars table calculate the maximum, average, and minimum price for each model manufactured in different years.
Oplossing
Schakel over naar desktop voor praktijkervaringGa verder vanaf waar je bent met een van de onderstaande optiesBedankt voor je feedback!
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
Swipe to start coding
From the audi_cars table calculate the maximum, average, and minimum price for each model manufactured in different years.
Oplossing
Schakel over naar desktop voor praktijkervaringGa verder vanaf waar je bent met een van de onderstaande optiesBedankt voor je feedback!
Schakel over naar desktop voor praktijkervaringGa verder vanaf waar je bent met een van de onderstaande opties