Count records from table based on conditions

[jchacko_rxsense]

I have one table:

TAB A
TaskName, UserID, UserEnabled 
A,1,T
A,2,T
A,3,F
B,4,F
B,5,F
C,6,T
C,7,T
D,8,F
D,9,NULL

I need to count Distinct TaskNames for only the tasks having UserEnabled as 'F' or NULL only.

So the output should be:

TaskName
B
D

Distinct count should be 2.

[jchacko_rxsense]

I have one table:

TAB A
TaskName, UserID, UserEnabled 
A,1,T
A,2,T
A,3,F
B,4,F
B,5,F
C,6,T
C,7,T
D,8,F
D,9,NULL

I need to count Distinct TaskNames for only the tasks having UserEnabled as 'F' or NULL only.

So the output should be:

TaskName
B
D

Distinct count should be 2.

[rwunderlich]

=Count({<UserEnabled ={'F','NULL'}> - <TaskName = P({<UserEnabled -={'F','NULL'}>} TaskName)> } DISTINCT TaskName)

-Rob

[jchacko_rxsense]

Hey thanks for the revert but the output of this I am getting zero. Also if possible could you please explain me the above script as well.

[PrashantSangle]

@jchacko_rxsense , I tried with @rwunderlich answer, it is giving me correct answer. How you are trying it? & where you are trying it?

[jchacko_rxsense]

One question, Is the 'NULL' in the code above being read as a text value or as NULL value which is usually shown as - in table.

Also I am trying in on my KPI in front end.

[rwunderlich]

In the expression, I was treating NULL as a text value. If you meant actual null, I would need to modify the expression.

-Rob

[jchacko_rxsense]

Yes please, I want to use actual NULL.

To explain the requirement again. I need to find the distinct count of TaskName which have their entire UserEnabled as the following combinations:

TaskName, User, UserEnabled
A, 1, False
A, 2, False
B, 3, False
B, 4, Null (Not text value. This is actual NULL)
C, 5, Null
So the distinct count of the TaskName will be 2 (TaskName: A,B,C will be counted).

So I want TaskNames which have all their users as False or NULL(Not text value but actual NULL).

[rwunderlich · Accepted solution]

Here it is dealing with real null(). 

=Count({<TaskName ={"=UserEnabled='F' or IsNull(UserEnabled)"}>
- <TaskName = P({<UserEnabled ={'T'}> } TaskName)> } DISTINCT TaskName)

-Rob
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