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SQL Basics

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How many?

What if you want to know the exact number of observations in your database? Counting manually sounds like a very very bad idea.

Fortunately, SQL has the built-in functionality of counting rows. To count the number of rows in the whole dataset use COUNT *. For example, we can count the total number of our website being visited by using the following query:

12
SELECT COUNT(*) FROM visitors
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Please note, that for counting the total number of rows you must place * within parenthesis, like COUNT(*).

Oppgave

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Count number of Audi cars sold from audi_cars table.

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book
How many?

What if you want to know the exact number of observations in your database? Counting manually sounds like a very very bad idea.

Fortunately, SQL has the built-in functionality of counting rows. To count the number of rows in the whole dataset use COUNT *. For example, we can count the total number of our website being visited by using the following query:

12
SELECT COUNT(*) FROM visitors
copy

Please note, that for counting the total number of rows you must place * within parenthesis, like COUNT(*).

Oppgave

Swipe to start coding

Count number of Audi cars sold from audi_cars table.

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

Sveip for å vise menyen

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