How many unique?
But what if we want to calculate the number of unique site visitors? Sounds like a combination of selecting unique and then counting...
Yes, that's the point! To calculate the number of unique observations over a certain column use COUNT(DISTINCT( ... )) statement. For example,
12SELECT COUNT(DISTINCT(user_id)) FROM visitors
This query will return a single value - the number of unique user_id in the visitors table.
Swipe to start coding
Count the number of different cars models in the audi_cars table.
Lösung
Wechseln Sie zum Desktop, um in der realen Welt zu übenFahren Sie dort fort, wo Sie sind, indem Sie eine der folgenden Optionen verwendenDanke für Ihr Feedback!
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Awesome!
Completion rate improved to 2.63Awesome!
Completion rate improved to 2.63How many unique?
But what if we want to calculate the number of unique site visitors? Sounds like a combination of selecting unique and then counting...
Yes, that's the point! To calculate the number of unique observations over a certain column use COUNT(DISTINCT( ... )) statement. For example,
12SELECT COUNT(DISTINCT(user_id)) FROM visitors
This query will return a single value - the number of unique user_id in the visitors table.
Swipe to start coding
Count the number of different cars models in the audi_cars table.
Lösung
Wechseln Sie zum Desktop, um in der realen Welt zu übenFahren Sie dort fort, wo Sie sind, indem Sie eine der folgenden Optionen verwendenDanke für Ihr Feedback!
single
Awesome!
Completion rate improved to 2.63How many unique?
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But what if we want to calculate the number of unique site visitors? Sounds like a combination of selecting unique and then counting...
Yes, that's the point! To calculate the number of unique observations over a certain column use COUNT(DISTINCT( ... )) statement. For example,
12SELECT COUNT(DISTINCT(user_id)) FROM visitors
This query will return a single value - the number of unique user_id in the visitors table.
Swipe to start coding
Count the number of different cars models in the audi_cars table.
Lösung
Wechseln Sie zum Desktop, um in der realen Welt zu übenFahren Sie dort fort, wo Sie sind, indem Sie eine der folgenden Optionen verwendenDanke für Ihr Feedback!
