when to use count instead of DistinctCount?

[Anonymous]

I am doing a quick course on DAX in datacamp... they have created this measure:

Transaction count = Count([FactInternetSale[SalesOrderNumber])

And then using it to do:
Average Transaction = DIVIDE([Total Sales], [Transaction Count])

Why they used Count and not CountDistinct?

This seems wrong... Same SalesOrderNumber might appear 100 times, and Count shall count 100 orders...

[Anonymous]

Hello @Anonymous 
They are using count to show the average of each transaction and each transaction has a different ID. In this case, you can use both COUNT and DISTINCTCOUNT. You should use COUNT as this will increase the performance.

[Anonymous]

no se usa  CountDistinct, ya que solo se estaria contando los campos distintos del campo [Transaction Count]),

el promedio se toma de la sumatoria de los datos y se divide en  la cantidad de datos. sin importar que sean iguales 

[Jihwan_Kim]

Hi, @Anonymous 

I think, in the FactInternetSales Table, SalesOrderNumber Column is the primary key column. If I am not wrong, the result might be the same.

Hi, My name is Jihwan Kim.

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