Creating table with unique values and min/max timestamps

[filarap]

Hi all,

I am strugling to create calculation based on unique values from a table.

I need to calculate average duration using only unique ID taking earliest and oldest timestamps. 

One ID should only have one create and close in table to have correct calculation. Please see table 3 for what i need:

WHat i started with:

table 1

ID	Closed	Created	Duration
1	05/09/2019	14/09/2019	9
2	07/09/2019	15/09/2019	8
3	10/09/2019	13/09/2019	3
1	08/09/2019	15/09/2019	7
2	08/09/2019	14/09/2019	6
1	05/09/2019	13/09/2019	8
4	02/09/2019	14/09/2019	12

Then i managed to create:

table 3

ID	Closed	Created	Duration	Earliest	Oldest	Duration per case
1	05/09/2019	14/09/2019	9	05/09/2019	15/09/2019	10
2	07/09/2019	15/09/2019	8	07/09/2019	15/09/2019	8
3	10/09/2019	13/09/2019	3	10/09/2019	13/09/2019	3
1	08/09/2019	15/09/2019	7	05/09/2019	15/09/2019	10
2	08/09/2019	14/09/2019	6	07/09/2019	15/09/2019	8
1	05/09/2019	13/09/2019	8	05/09/2019	15/09/2019	10
4	02/09/2019	14/09/2019	12	02/09/2019	13/09/2019	11

And then i already cteated new table with unique values (using VALUES()). Not sure if this is the best way, but the one i have so far. What i need in the end is:

table 3

ID	Earliest	Oldest	Duration per case
1	05/09/2019	15/09/2019	10
2	07/09/2019	15/09/2019	8
3	10/09/2019	13/09/2019	3
4	02/09/2019	13/09/2019	11

So my Average is 8 insteaed 8.7

Please help with methodology

Regards

Filarap

[v-xuding-msft · Accepted solution]

Hi @filarap ,

By my test, the oldest date of ID 4 should be 14/09/2019. Are you sure that the output is right (13/09/2019 )? If the date is 14/09/2019, the average value is 8.7. The following is my formulas. And I attached my sample that you can reference.

Calculated column:
Earliest = CALCULATE(MIN('Table'[Closed]),ALLEXCEPT('Table','Table'[ID]))
Oldest = CALCULATE(MAX('Table'[Created]),ALLEXCEPT('Table','Table'[ID]))
Duration per case = DATEDIFF('Table'[Earliest],'Table'[Oldest],DAY)
AVG = AVERAGE('Table'[Duration per case]) 
Measure:
Average = AVERAGE('Table'[Duration per case])

Best Regards,

Xue Ding

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

[filarap]

Hi Xue Ding,

You are correct, my error here.

Thank you for help, i managed to do it with your solution.

Regards

Filarap