Set expression intersection

[Anku]

Hello everyone, 

I am trying to list IDs in a table which are common for past 3 consecutive months. I tried intersection but it didn't working. 

Note: I can't change the script and hence need to do it using set expression. 

Thanks! 

[rwunderlich]

 Can you some sample values and expected results?

-Rob

[Anku]

Hi @rwunderlich , please refer below the snapshot of dummy data.