Need Help_Dax

[Rt0790]

Hi All, I have a dataset that is getting dates list between start date time and end date time and students that are scheduled for courses, 

start datetime	end datetime	StudentID	List dates	Courses	Scheduled
11/16/2022 12:06pm	2/28/2023 12:00pm	15	1/10/2023	Math	TRUE
11/16/2022 12:06pm	2/28/2023 12:00pm	15	1/10/2023	Chem	TRUE

created a new column "scheduled" to check if a student is scheduled for a course at 8 am everyday by using 

"at 8am = var _1 = date(year(list dates),month(list dates),day(list dates)+TIME (8,0,0)
Return
IF ( _1 <= end datetime && _1 >= start date time || _1-1 < end datetime && _1-1 >= start datetime, "TRUE","FALSE") "

My question is if a student is schedueld for more than one subject at the same time on any given day I want CHEM to be TRUE and not math 

Expected result

start datetime	end datetime	StudentID	List dates	Courses	Scheduled
11/16/2022 12:06pm	2/28/2023 12:00pm	15	1/10/2023	Math	FALSE
11/16/2022 12:06pm	2/28/2023 12:00pm	15	1/10/2023	Chem	TRUE

Thanks in advance

Really appreciate any help.

[v-binbinyu-msft · Accepted solution]

Hi @Rt0790 ,

Please try to create a new column with below dax formula:

Column =
VAR ed = [end datetime]
VAR sd = [start datetime]
VAR _id = [StudentID]
VAR cse = [Courses]
VAR tmp =
    SUMMARIZE (
        'Table',
        'Table'[StudentID],
        'Table'[List dates],
        'Table'[start datetime],
        'Table'[end datetime],
        "Ctn", COUNTROWS ( 'Table' )
    )
VAR tmp1 =
    CALCULATETABLE ( VALUES ( 'Table'[StudentID] ), FILTER ( tmp, [Ctn] >= 2 ) )
VAR _1 =
    DATE ( YEAR ( [List dates] ), MONTH ( [List dates] ), DAY ( [List dates] ) + TIME ( 8, 0, 0 ) )
VAR _flg =
    IF ( _1 <= ed && _1 >= sd || _1 - 1 < ed && _1 - 1 >= sd, "TRUE", "FALSE" )
RETURN
    SWITCH (
        TRUE (),
        _id
            IN tmp1
            && cse = "Chem",
            IF ( _1 <= ed && _1 >= sd || _1 - 1 < ed && _1 - 1 >= sd, "TRUE", "False" ),
        _id
            IN tmp1
            && cse <> "Chem", "False",
        NOT ( _id IN tmp1 ),
            IF ( _1 <= ed && _1 >= sd || _1 - 1 < ed && _1 - 1 >= sd, "TRUE", "FALSE" )
    )

Please refer the attached .pbix file.

Best regards,
Community Support Team_Binbin Yu
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.

[Rt0790]

Hi, I tried this on a similar dataset and I get the following error, "Argument of function 'DATE' has the wrong data type or the result is too large or too small".

[Peter_Beck]

Hi -

One very way to do this, which I think is a bit crude but might work, is to group on the fields you have shown above in the Power Query editor, and add a row number for the Courses Scheduled subject. A technique for adding an index on groups is here:

https://radacad.com/create-row-number-for-each-group-in-power-bi-using-power-query

Then you would add a condition in your forumula to check to see if the index of the group was "1", which would correspond with "CHEM" in the grouping because it comes ahead of math. It isn't pretty but I think it would work.

Hope this helps,

Peter