Rank based on datetime

[Anonymous]

Hi,

I need some help. 

I want to add a Rank column to below table based on the AgentID and Datetime column.

So the most recent Datetime for the agent should be 0, then 1 so on 

If for any agent (i.e AgentID 3) Datetime is same and has AgentStatis "on Call" then that should be ranked 0. Otherwise any can be ranked 0 

AgentID	AgentStatus	DateTime	Rank (New Column)
1	Log in	10/02/21  15:05:50	0
1	On Call	10/02/21  12:10:10	1
1	Break	09/02/21  16:05:52	2
2	Log in	10/02/21  02:05:39	0
2	Log in	10/02/21  01:10:22	1
3	On Call	10/02/21  12:05:15	0
3	Log Off	10/02/21  12:05:15	1

Thanks 

Daven

[parry2k · Accepted solution]

@Anonymous try this measure

Rank = 
VAR __countFlag = 
    CALCULATE ( 
        COUNTROWS ( 'Rank' ), 
        ALLEXCEPT ( 'Rank', 'Rank'[AgentID], 'Rank'[DateTime] ) 
    ) 
VAR __rank = 
    RANKX ( 
        ALLEXCEPT ( 'Rank', 'Rank'[AgentID] ), 
        CALCULATE ( MIN ( 'Rank'[DateTime] ) ), , 
        DESC, DENSE 
    )
RETURN  
IF ( 
    __countFlag > 1 && MAX ( 'Rank'[AgentStatus] ) = "On Call", 0, 
    __rank - IF ( __countFlag = 1, 1, 0 ) 
)

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[Anonymous]

Thanks Parry 

It worked!