Returning value from Table A if Table B condition meet Table A

[law_90]

Hi all,

I am new to PowerBI and currently developing some dashboard by facing some issue.

I have 2 tables - namely historical_data and current_weekly_data

The historical_data consist of 3 columns, Issue Name, Open Date and Status shown below:

The current_weekly_data will only consist of 1 column - Issue Name.

What I wanted to achieve is to create the Open Date and Status calculated column in current_weekly_data table to achieve the following:

I know this can be done using Merge in Power Query but the data is huge and having slowness in performance when doing that and hence I would request for some guidance in doing this using DAX.

I have no idea how can I retrieve the value from historical_data table to be inserted into the current_weekly_data table if the issue name match.. any help would be very much appreciated.

Thank you!

[amitchandak]

@law_90 , You can create a new column in dax like

in current week table =

var _cnt = countx(his, his[issue Name] = curr[Issue Name] && his[Open Date] < curr[Open date]), his[Issue name])

return

if(not(isblank(_cnt)), "Remain", "Newly Added")

refer 4 ways (related, relatedtable, lookupvalue, sumx/minx/maxx with filter) to copy data from one table to another
https://www.youtube.com/watch?v=Wu1mWxR23jU
https://www.youtube.com/watch?v=czNHt7UXIe8