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adityakommu Member
Member

Compute Lead and Lag

Hello All,

 

How do you perform lead and lag functions in DAX?

 

Thanks

Aditya

1 ACCEPTED SOLUTION

Accepted Solutions
Highlighted
Super User
Super User

Re: Compute Lead and Lag

Hi @adityakommu,

 

The DAX calculations are based on context so if you want to perform calculations that are based on the previous records or next records you have several ways of doing this from the EARLIER function, the time intelligence functions, the usage of ID column.

 

I have setup a simple model with tabel below:

 

ID             ENAME     JOB               SAL

1MILLERCLERK1300
2CLARKMANAGER2450
3KINGPRESIDENT5000
4SMITHCLERK800
5ADAMSCLERK1100
6JONESMANAGER2975
7SCOTTANALYST3000
8FORDANALYST3000
9JAMESCLERK950
10MARTINSALESMAN1250
11WARDSALESMAN1250
12TURNERSALESMAN1500
13ALLENSALESMAN1600
14BLAKEMANAGER2850
15MARTINSALESMAN1250
16WARDSALESMAN1250
17TURNERSALESMAN1500
18ALLENSALESMAN1600
19BLAKEMANAGER2850

 

If you add this two measure you will get the calculation with previous row and next row however this is just an example, I did it with a measure but you can also do it in the query editor making it like SQL with an addtinal column. So you have several ways of making LEAD and LAG calculations depending on your model and necessities.

 

Previous Difference =
VAR Selecet_Emp =
    ( MAX ( Salary[ID] ) - 1 )
RETURN
    IF (
        HASONEFILTER ( Salary[ID] );
        SUM ( Salary[SAL] )
            - CALCULATE (
                SUM ( Salary[SAL] );
                FILTER (
                    ALL ( Salary[ID]; Salary[ENAME]; Salary[JOB] );
                    Salary[ID] = Selecet_Emp
                )
            );
        BLANK ()
    )




Next Difference = 
VAR Selecet_Emp =
    ( MAX ( Salary[ID] ) + 1 )
RETURN
    IF (
        HASONEFILTER ( Salary[ID] );
        SUM ( Salary[SAL] )
            - CALCULATE (
                SUM ( Salary[SAL] );
                FILTER (
                    ALL ( Salary[ID]; Salary[ENAME]; Salary[JOB] );
                    Salary[ID] = Selecet_Emp
                )
            );
        BLANK ()
    )

cal.png

 

Regards,

MFelix

 

 



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1 REPLY 1
Highlighted
Super User
Super User

Re: Compute Lead and Lag

Hi @adityakommu,

 

The DAX calculations are based on context so if you want to perform calculations that are based on the previous records or next records you have several ways of doing this from the EARLIER function, the time intelligence functions, the usage of ID column.

 

I have setup a simple model with tabel below:

 

ID             ENAME     JOB               SAL

1MILLERCLERK1300
2CLARKMANAGER2450
3KINGPRESIDENT5000
4SMITHCLERK800
5ADAMSCLERK1100
6JONESMANAGER2975
7SCOTTANALYST3000
8FORDANALYST3000
9JAMESCLERK950
10MARTINSALESMAN1250
11WARDSALESMAN1250
12TURNERSALESMAN1500
13ALLENSALESMAN1600
14BLAKEMANAGER2850
15MARTINSALESMAN1250
16WARDSALESMAN1250
17TURNERSALESMAN1500
18ALLENSALESMAN1600
19BLAKEMANAGER2850

 

If you add this two measure you will get the calculation with previous row and next row however this is just an example, I did it with a measure but you can also do it in the query editor making it like SQL with an addtinal column. So you have several ways of making LEAD and LAG calculations depending on your model and necessities.

 

Previous Difference =
VAR Selecet_Emp =
    ( MAX ( Salary[ID] ) - 1 )
RETURN
    IF (
        HASONEFILTER ( Salary[ID] );
        SUM ( Salary[SAL] )
            - CALCULATE (
                SUM ( Salary[SAL] );
                FILTER (
                    ALL ( Salary[ID]; Salary[ENAME]; Salary[JOB] );
                    Salary[ID] = Selecet_Emp
                )
            );
        BLANK ()
    )




Next Difference = 
VAR Selecet_Emp =
    ( MAX ( Salary[ID] ) + 1 )
RETURN
    IF (
        HASONEFILTER ( Salary[ID] );
        SUM ( Salary[SAL] )
            - CALCULATE (
                SUM ( Salary[SAL] );
                FILTER (
                    ALL ( Salary[ID]; Salary[ENAME]; Salary[JOB] );
                    Salary[ID] = Selecet_Emp
                )
            );
        BLANK ()
    )

cal.png

 

Regards,

MFelix

 

 



Did I answer your question? Mark my post as a solution!

Proud to be a Datanaut!