how many participants on the table
select count ( * ) from participants
what is participant type code of karlee batz
select participant_type_code from participants where participant_details = "Karlee Batz"
what is most common participant type
select participant_type_code from participants group by participant_type_code order by count ( * ) desc limit 1
what is the participant id in lupe deckow
select participant_id from participants where participant_details = "Lupe Deckow"