Kurssisisältö
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.
Ratkaisu
Vaihda työpöytään todellista harjoitusta vartenJatka siitä, missä olet käyttämällä jotakin alla olevista vaihtoehdoistaKiitos palautteestasi!
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.
Ratkaisu
Vaihda työpöytään todellista harjoitusta vartenJatka siitä, missä olet käyttämällä jotakin alla olevista vaihtoehdoistaKiitos palautteestasi!
Vaihda työpöytään todellista harjoitusta vartenJatka siitä, missä olet käyttämällä jotakin alla olevista vaihtoehdoista