How many enzymes do not have any interactions?
select count ( * ) from enzyme where id not in ( select enzyme_id from medicine_enzyme_interaction )
List enzyme names in alphabetical order
select name from enzyme order by name
Give me enzymes with interaction type "inhibitor"
select distinct name from enzyme as t1 join medicine_enzyme_interaction as t2 on t2.enzyme_id = t1.id where interaction_type = 'inhibitor'