First transaction for each user for each day

[madzgalj_darko]

Hello everyone,
I was searching all around for DAX for my situation. Hope someone here can help me
So basically i have a table with thousands transactions per day, I need a DAX that is gonna give me earliest transaction for each day for each customer ID, for example if customer had 5 transactions that day, i want to see the first one, and same like that for every unique ID. Slicer for date will be set for only one day. for example only for 03.05.2023. And I want earliest transaction for every user that day. 
All best, and thank you in advanced!

[madzgalj_darko]

Hi @FreemanZ ,thank you for your willingness to help.
So, I'm gonna try to explain as simple as possible.
So basically our customer have multiple transactions per day. What I need is the get their first transaction of certain day. I'm gonna post pic with example.

 Okay, so i circled couple examples. so you see user 3659 had two transaction, first one is 5.00$ at 19:55, and the other one is for 10.00$ at 19:45. Some users only have one transaction per day which is alright. But for those with multiple transactions i need DAX to return first transaction for that day for each user(in this case it is user-3658,amount 10.00$,time 19:45). So I need earliest transaction for each day, becouse most of the users have transactions every day. I want to see what is their first transaction in a day for every user.
 I hope I explained well.
Thank you! 

[FreemanZ · Accepted solution]

hi @madzgalj_darko 

Supposing you have a table like:

user_id	amount	created_at
A	1	5/4/2023 10:01
A	2	5/4/2023 10:02
A	3	5/4/2023 10:03
B	11	5/4/2023 10:01
B	22	5/4/2023 10:02
B	33	5/4/2023 10:03

try like:
1)add a calculated column like:

date = DATEVALUE([created_at])

2)plot a table visual with user_id and date columns with a measure like:

DailyFirstAmt = 
MINX(
    TOPN(
        1,
        data,
        data[created_at],
        1
    ),
    data[amount]
)

it worked like:

[madzgalj_darko]

Perfect @FreemanZ,
This is exactly what i was looking for! You really helped!
Thank you, all the best! 

[FreemanZ]

hi @madzgalj_darko 

it would be much easier if you could also provide some sample data.