SELECT sum(t2.Total_spent) FROM visitor AS t1 JOIN visit AS t2 ON t1.id  =  t2.visitor_id WHERE t1.Level_of_membership  =  1
What is the total ticket expense of the visitors whose membership level is 1?
SELECT sum ( t2.Total_spent ) FROM visitor AS t1 JOIN visit AS t2 ON t1.id = t2.visitor_id WHERE t1.Level_of_membership = 1
select sum ( t2 . total_spent ) from visitor as t1 join visit as t2 on t1 . id = t2 . visitor_id where t1 . level_of_membership = value
What is the total ticket expense of the visitors whose membership level is 1 ?