Using single SELECT instead of multiple select in a loop for matching rows

Question

I have a Oracle table with userId and adId (and some other stuff like ad Description, Date Posted etc.). I want to determine if matching userId, adId row exists or not like SELECT * from Ad WHERE userId=xxx and adId=yyy for a list of userId and adId object, e.g. listOf<UserAd>() (using kotlin)

Can I do this in one SELECT statement, instead of looping over UserAd pair in the list and collecting data for which pair the row exists and for which pair it does not? I need to find out for which pair, row exists and for which pair row does not exist.