Previous date of occurrence

[Anonymous]

Hello

I'm trying to get the date of the last occurrence.

Example

Employee ID	Date of visit	Discipline
1	9/1/2021	RN
1	9/6/2021	CNA
1	9/10/2021	RN
1	9/25/2021	RN
2	9/5/2021	RN
2	9/10/2021	RN

What I Need RN Last Visit Date or Example Column #4

Employee ID	Date of visit	Discipline	Previous occurrence
1	9/1/2021	RN
1	9/6/2021	CNA
1	9/10/2021	RN	9/1/2021
1	9/25/2021	RN	9/10/2021
2	9/5/2021	RN
2	9/10/2021	RN	9/5/2021

the ultimate goal is to find the number of days between each visit, but I thought I needed to find the previous occurrence first. then perform a datediff measurement

Thanks in advance

[v-shex-msft]

Hi @Anonymous,

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Regards,

Xiaoxin Sheng

[Anonymous]

Hi, nope. None of the suggestions helped get what I was looking for. 

[v-shex-msft]

Hi @Anonymous,

So you mean you need a calculated column to do some calculations in direct query mode? AFAIK, most DAX functions have been limited to use in calculated column/table if you are working with 'direct query' mode.

What type of data source are you worked on? If it supports advanced queries, you can try to add a custom column in the query.

Regards,

Xiaoxin Sheng

[ERD]

Hi @Anonymous ,

Did you try to create a measure? For example,

days = 
VAR currentEmpID = MAX ( T[EmployeeID] )
VAR currentDisc = MAX ( T[Discipline] )
VAR currentDate = MAX ( T[VisitDate] )
VAR prevDate =
    CALCULATE (
        MAX ( T[VisitDate] ),
        FILTER (
            ALL ( T ),
            T[EmployeeID] = currentEmpID
                && T[Discipline] = currentDisc
                && T[VisitDate] < currentDate
        )
    )
RETURN
    COALESCE ( DATEDIFF ( prevDate, currentDate, DAY ), 0 )

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

[CNENFRNL]

Previous occurrence = 
MAXX(
    FILTER(
        VISIT,
        VISIT[Employee ID] = EARLIER( VISIT[Employee ID] )
            && VISIT[Discipline] = EARLIER( VISIT[Discipline] )
            && VISIT[Date of visit] < EARLIER( VISIT[Date of visit] )
    ),
    VISIT[Date of visit]
)

[Anonymous]

Can't use MAXX in Direct Query either

[parry2k]

@Anonymous try adding this column 

Prev Visit Date = 
VAR __d = Visit[Visit Date]
RETURN
IF ( Visit[Discipline] = "RN",
    CALCULATE ( 
        MAX ( Visit[Visit Date] ), 
        Visit[Visit Date] < __d, 
        Visit[Employee ID] = EARLIER ( Visit[Employee ID] ) 
    ) 
)

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[Anonymous]

This is the error message i am receiving. I am unable to change from DirectQuery.