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.
Soluzione
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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.
Soluzione
Cambia al desktop per esercitarti nel mondo realeContinua da dove ti trovi utilizzando una delle opzioni seguentiGrazie per i tuoi commenti!
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.
Soluzione
Cambia al desktop per esercitarti nel mondo realeContinua da dove ti trovi utilizzando una delle opzioni seguentiGrazie per i tuoi commenti!
