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ROUNDing

In the last chapter, you solved the task and received a number with many digits after the decimal place. This is surely precise, but not representative, as there is no way to pay 0.002$, for example. It would be great if we could round numbers to some digits.

Surely it's also implemented into SQL! To round number to n decimal places use ROUND(column_name, n) function. For example, from our audi_cars dataset let's calculate the average price of TT model cars with mileage less than 3000 and round the result to 0 decimals (so it will be an integer).

SELECT ROUND(AVG(price), 0)
FROM audi_cars
WHERE model = 'TT' AND mileage < 3000

              
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SELECT ROUND(AVG(price), 0)
FROM audi_cars
WHERE model = 'TT' AND mileage < 3000
copy

That's more representative!

Oppgave

Swipe to start coding

From the audi_cars table calculate the average price for Petrol cars (column fueltype) with Semi-Auto transmission (column transmission). Round the result to 2 digits after the comma.

Løsning

SELECT ROUND(AVG(price), 2)
FROM audi_cars
WHERE fueltype = 'Petrol' AND transmission = 'Semi-Auto'

Alt var klart?

Hvordan kan vi forbedre det?

Takk for tilbakemeldingene dine!

Seksjon 3. Kapittel 4

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