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:
12SELECT COUNT(*) FROM visitors
Please note, that for counting the total number of rows you must place
*within parenthesis, likeCOUNT(*).
Swipe to start coding
Count number of Audi cars sold from audi_cars table.
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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:
12SELECT COUNT(*) FROM visitors
Please note, that for counting the total number of rows you must place
*within parenthesis, likeCOUNT(*).
Swipe to start coding
Count number of Audi cars sold from audi_cars table.
Ratkaisu
Vaihda työpöytään todellista harjoitusta vartenJatka siitä, missä olet käyttämällä jotakin alla olevista vaihtoehdoistaKiitos palautteestasi!
Awesome!
Completion rate improved to 2.63single
