Kursinhalt
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.
Lösung
Wechseln Sie zum Desktop, um in der realen Welt zu übenFahren Sie dort fort, wo Sie sind, indem Sie eine der folgenden Optionen verwendenDanke für Ihr 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.
Lösung
Wechseln Sie zum Desktop, um in der realen Welt zu übenFahren Sie dort fort, wo Sie sind, indem Sie eine der folgenden Optionen verwendenDanke für Ihr Feedback!
Wechseln Sie zum Desktop, um in der realen Welt zu übenFahren Sie dort fort, wo Sie sind, indem Sie eine der folgenden Optionen verwenden