required Delta of data

[Sarath5c8]

I need the delta of the data as the result 

when the table has 

ID	Parent	Child
1	P1	C1
1	P1	C2
1	P1	C3
1	P2	C7
1	P2	C2
1	P2	C3
2	P3	C1
2	P3	C4
3	P4	C5
3	P4	C6
3	P4	C7
3	P4	C8
3	P4	C9
3	P5	C5
3	P5	C6
3	P5	C7
3	P5	C8
3	P5	C9

Output: 

ID	Parent	Child
1	P1	C1
1	P2	C7

Note: ID 1 has 2 different parents and target is both should have same children under it (i.e no of children and value of children too) 
ID2 has only 1 parent so can be ignored.
ID3 had 2 parents and children are equal 
Hence output displays only mismatched once.
i did a recursive mapping but if an id has more than 10 parents and multiple children under it, tracking is becoming difficult. 
Can anyone help with an optimized solution possible.

[v-zhouwen-msft]

Hi @Sarath5c8 ,

I don't quite understand your question. Is this your desired result?

Can you explain why you get 'C1' and 'C7'? Are you intending to show parent items with the same children under one ID?

[Sarath5c8]

Yah that's the desired output because if you see under 1 we have two Parents P1 & P2 which has C2 & C3 common and C1 & C7 present only once hence those need to stand out and will be the result.

if ID has 1 parent we can ignore it straight away.

[v-zhouwen-msft · Accepted solution]

Hi @Sarath5c8 ,

The Table data is shown below:

Please follow these steps:
1. Use the following DAX expression to create a measure

MEASURE =
VAR _ChildCount =
    CALCULATE ( COUNTROWS ( 'Table' ), ALL ( 'Table'[Parent] ) )
VAR _ParentCount =
    CALCULATE (
        COUNTROWS ( SUMMARIZE ( 'Table', 'Table'[ID], 'Table'[Parent] ) ),
        ALLEXCEPT ( 'Table', 'Table'[ID] )
    )
RETURN
    IF ( _ParentCount = 1, BLANK (), IF ( _ChildCount <> 1, BLANK (), "" ) )

2.Final output

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