New costumers per day

[hananb]

Hi,

I tried to write a measure to find how many new customer we got in each day.

I created a mew table

First = SUMMARIZE(sales,Sales[Customer ID],"First Purchase",min(Sales[Purchase Date]))

I connected the "First Purchase" column, to the the date column in the calendar table, and with a measure:

Count New Client Alt. = COUNTROWS(First)

it's work.

But if I want to put all of them together:

Count New Client  = COUNTROWS(SUMMARIZE(sales,Sales[Customer ID],"First Purchase",min(Sales[Purchase Date])))

I got  a wrong answer, and I don't understand why (maybe because the lack of connection?).

Can someone explain it, and what is the right measure?

Thank you

[OwenAuger · Accepted solution]

@hananb

Have a look at the "new customers" patterns discussed on these pages:

https://www.sqlbi.com/articles/computing-new-customers-in-dax/

https://www.daxpatterns.com/new-and-returning-customers/

For example, I took the pattern discussed in the first link, and changed the column names to match your scenario (assuming you have a 'Calendar'[Date] column):

Count New Client =
COUNTROWS (
    FILTER (
        CALCULATETABLE (
            ADDCOLUMNS (
                VALUES ( Sales[Customer ID] ),
                "First Purchase", CALCULATE ( MIN ( Sales[Purchase Date] ) )
            ),
            ALL ( 'Calendar' )
        ),
        CONTAINS ( VALUES ( 'Calendar'[Date] ), 'Calendar'[Date], [First Purchase] )
    )
)

The only relationship required is between Sales[Purchase Date] and 'Calendar'[Date].

Does the above code or something from the above links work?

Regards,

Owen

[hananb]

Thank you,

it's work.