retrieving values in a row when the value of one column is equal to the value of another column

[Lidiar]

I've used dummies data to show the question.

Id	Index	ProjectId	Predecessors
1	1	66	5
2	5	66	3

I need to find for each predecessor, the index equal with predecessor value then compare the ProjectId in the predecessor row  and the project id of the index(that is equal with predecessor index) if they are equal then return the Id of the index.

in this example:
I read first row =>index =1  predecessor = 5
I look for 5 in all index column => go to index = 5
if projectId(index = 5) = projectId (index = 1) then return Id (index = 5)

Thanks for taking time, in advance.

[amitchandak · Accepted solution]

@Lidiar , Try a new column like

new column =
var _Predecessors = [Predecessors]
var _ProjectId = [ProjectId]
return
maxx(filter(Table, [Index] =_Predecessors && [ProjectId] =_ProjectId), [id])

[Lidiar]

Thank you. Great job!