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SQL Basics

bookHow 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(*).

Compito

Swipe to start coding

Count number of Audi cars sold from audi_cars table.

Soluzione

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Sezione 1. Capitolo 6
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bookHow many?

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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(*).

Compito

Swipe to start coding

Count number of Audi cars sold from audi_cars table.

Soluzione

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Tutto è chiaro?

Come possiamo migliorarlo?

Grazie per i tuoi commenti!

Sezione 1. Capitolo 6
single

single

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