Display only records where a dimension entry comes up more than once
I'm having trouble with a straight table, where I have to display only records where a certain dimension's value comes up more than once.
Lets say I have a dimension called ID, and then Username as an additional dimension. The end result must be that the chart must only show entries where the ID column is not distinct, i.e. if ID number 1234 is associated with more than one Username, show those entries, otherwise don't.