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Lære More aggregate statistics! | Grouping
SQL Basics

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More aggregate statistics!

Can we calculate more than one aggregate statistic while grouping? Surely we can!

For example, from the audi_cars table, we can calculate the maximum price and tax for each year.

123
SELECT AVG(price) AS "avg_price", AVG(tax) AS "avg_tax", year FROM audi_cars GROUP BY year
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Please note, while grouping you can put non-aggregated function within SELECT statement only if it figures within GROUP BY, otherwise - it has to be aggregated.

Also note, that in the example above without aliases (AS) there will be two columns with identical names, which is unacceptable in SQL.

Another note: you can use aggregate functions for ordering after GROUP BY statement. It will filter based on calculations within groups.

Oppgave

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From the audi_cars table find out the minimum and the maximum prices for each model. Sort in descending order by minimum price.

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More aggregate statistics!

Can we calculate more than one aggregate statistic while grouping? Surely we can!

For example, from the audi_cars table, we can calculate the maximum price and tax for each year.

123
SELECT AVG(price) AS "avg_price", AVG(tax) AS "avg_tax", year FROM audi_cars GROUP BY year
copy

Please note, while grouping you can put non-aggregated function within SELECT statement only if it figures within GROUP BY, otherwise - it has to be aggregated.

Also note, that in the example above without aliases (AS) there will be two columns with identical names, which is unacceptable in SQL.

Another note: you can use aggregate functions for ordering after GROUP BY statement. It will filter based on calculations within groups.

Oppgave

Swipe to start coding

From the audi_cars table find out the minimum and the maximum prices for each model. Sort in descending order by minimum price.

Løsning

Switch to desktopBytt til skrivebordet for virkelighetspraksisFortsett der du er med et av alternativene nedenfor
Alt var klart?

Hvordan kan vi forbedre det?

Takk for tilbakemeldingene dine!

close

Awesome!

Completion rate improved to 2.63

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