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Resolver I
Resolver I

Help needed for Cast and lag function


I need to add one custom column called "rank" by using below expression : 

sum(cast(booked != lag(booked,1)


Can Someone please help with the DAX/Measure expression.

Thanks in advance

Community Support
Community Support

Hi @Rup10 ,


Could you tell me if your problem has been solved? If it is, kindly Accept it as the solution. More people will benefit from it.


Best Regards,
Eyelyn Qin

Community Support
Community Support

Hi @Rup10 ,


Based on my researching, the LAG function returns values from a previous row in the table and the CAST function converts an expression from one datatype to another datatype.


But actually I'm not sure about your expected output, could please share more detail information to help us clarify your scenario?


In case you want the final result as shown below:


Please try LOOKUPVALUE() , RANKX() to add columns after adding a Index column in Power Query


IF (
        <> LOOKUPVALUE ( 'Table'[BOOKED], 'Table'[Index], [Index] - 1 ),
rankColumn =
RANKX ( 'Table', [BOOKED],, ASC, DENSE )


Here is the pbix file.


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

Super User
Super User

@Rup10 ,Can you share sample data and sample output in table format? Or a sample pbix after removing sensitive data.

Hi @amitchandak ,

Please find the attached(booked column sample data) image.


Thank you

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