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.
123SELECT AVG(price) AS "avg_price", AVG(tax) AS "avg_tax", year FROM audi_cars GROUP BY year
Please note, while grouping you can put non-aggregated function within
SELECTstatement only if it figures withinGROUP 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 BYstatement. It will filter based on calculations within groups.
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.
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Completion rate improved to 2.63More aggregate statistics!
Sveip for å vise menyen
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.
123SELECT AVG(price) AS "avg_price", AVG(tax) AS "avg_tax", year FROM audi_cars GROUP BY year
Please note, while grouping you can put non-aggregated function within
SELECTstatement only if it figures withinGROUP 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 BYstatement. It will filter based on calculations within groups.
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
Bytt til skrivebordet for virkelighetspraksisFortsett der du er med et av alternativene nedenforTakk for tilbakemeldingene dine!
Awesome!
Completion rate improved to 2.63single
