human
Schema:
Services (Service_ID, Service_Type_Code)
Participants (Participant_ID, Participant_Type_Code, Participant_Details)
Events (Event_ID, Service_ID, Event_Details)
Participants_in_Events (Event_ID, Participant_ID)
Please answer with SQL.
assistant
Sure, I understand.
human
How many events are there?
assistant
SELECT COUNT( distinct Event_ID ) FROM Participants_in_Events;
human
How many of them had participants whose details had substring 'Dr'?
assistant
SELECT COUNT( * ) FROM participants AS T1 JOIN Participants_in_Events AS T2 ON T1.Participant_ID = T2.Participant_ID WHERE T1.participant_details LIKE "%Dr.%" ;