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.
Solución
Cambia al escritorio para practicar en el mundo realContinúe desde donde se encuentra utilizando una de las siguientes opciones¡Gracias por tus comentarios!
single
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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.
Solución
Cambia al escritorio para practicar en el mundo realContinúe desde donde se encuentra utilizando una de las siguientes opciones¡Gracias por tus comentarios!
single
Awesome!
Completion rate improved to 2.63How many unique?
Desliza para mostrar el menú
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.
Solución
Cambia al escritorio para practicar en el mundo realContinúe desde donde se encuentra utilizando una de las siguientes opciones¡Gracias por tus comentarios!
