Query Editor Custom Column If function on Date

Hi, I have to create a custom column in the query editor which will show an indicator for the number of days, based on date.

If using calculated columns the formula will show as below... 

Last Two Months = IF(TODAY()-[Date]<=30,1,IF(TODAY()-[Date]<=60,2,0))

How can I get the same result when creating a custom column in the query editor?

Thank you in advance.