CREATE TABLE visit (Total_spent INTEGER, visitor_id VARCHAR(255)); CREATE TABLE visitor (id VARCHAR(255), Level_of_membership VARCHAR(255))
What is the total ticket expense of the visitors whose membership level is 1?
    
SQL: 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