Count customers between dates if they haven't purchased before

[Syndicate_Admin]

Good morning, everyone,

Thanks in advance for the help. I have a question for a long time and I do not know how to solve it. I work with a table that I simulate below.

I want to know how to count customers for dates that I mark on the calendar, as long as they have not bought before. Ahem: If I mark in the calendar the dates from 21/11 to 24/11, the number of different clients is 5. Now, if I march alone on 11/23, then it's 2. What I want to achieve is that if I mark the day 24/11 instead of counting 5, only count me 2 (customer 3 and 5), since customers 1, 2 and 4 have bought on previous dates.

I hope I haven't messed up too much.

Thank you again for your help.

Greetings

[v-kalyj-msft · Accepted solution]

Hi @Syndicate_Admin ,

According to your description, here's my solution. Create a calculated column.

Count =
SUMX (
    FILTER (
        'Table',
        'Table'[Clients] = EARLIER ( 'Table'[Clients] )
            && 'Table'[Date of purchase] = EARLIER ( 'Table'[Date of purchase] )
    ),
    IF (
        COUNTROWS (
            FILTER (
                'Table',
                'Table'[Clients] = EARLIER ( 'Table'[Clients] )
                    && 'Table'[Date of purchase] < EARLIER ( 'Table'[Date of purchase] )
            )
        ) + 0 = 0,
        1
    )
)

Put Date and the new column in a visual, get the correct result:

I attach my sample below for your reference.

Best Regards,
Community Support Team _ kalyj

If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.

[vanessafvg]

please provide the sample data in text form.

[Syndicate_Admin]

The example table.

Clients	Date of purchase	Units
Client 1	21/11/2022	35
Client 2	22/11/2022	48
Client 1	23/11/2022	12
Client 3	24/11/2022	24
Client 4	23/11/2022	56
Client 2	24/11/2022	24
Client 1	24/11/2022	36
Client 4	24/11/2022	12
Clinete 5	24/11/2022	18

The idea is to know for any day, the number of unique customers who have not bought since 21/11

Thank you