SELECT T1.stuid FROM participates_in AS T1 JOIN activity AS T2 ON T2.actid  =  T2.actid WHERE T2.activity_name  =  'Canoeing' INTERSECT SELECT T1.stuid FROM participates_in AS T1 JOIN activity AS T2 ON T2.actid  =  T2.actid WHERE T2.activity_name  =  'Kayaking'
Which students participate in both Canoeing and Kayaking as their activities? Tell me their student ids.
SELECT T1.stuid FROM participates_in AS T1 JOIN activity AS T2 ON T2.actid = T2.actid WHERE T2.activity_name = 'Canoeing ' INTERSECT SELECT T1.stuid FROM participates_in AS T1 JOIN activity AS T2 ON T2.actid = T2.actid WHERE T2.activity_name = 'Kayaking '
select t1 . stuid from participates_in as t1 join activity as t2 on t2 . actid = t2 . actid where t2 . activity_name = value intersect select t1 . stuid from participates_in as t1 join activity as t2 on t2 . actid = t2 . actid where t2 . activity_name = value
Which students participate in both Canoeing and Kayaking as their activities ? Tell me their student ids .