-- Database schema
| museum : Museum_ID [ INT ] primary_key , Name [ TEXT ] , Num_of_Staff [ INT ] , Open_Year [ TEXT ] | visitor : ID [ INT ] primary_key , Name [ TEXT ] , Level_of_membership [ INT ] , Age [ INT ] | visit : Museum_ID [ INT ] primary_key visit.Museum_ID = museum.Museum_ID , visitor_ID [ TEXT ] visit.visitor_ID = visitor.ID , Num_of_Ticket [ INT ] , Total_spent [ INT ] |
-- -- How many museums were opened after 2013 or before 2008?

SELECT count(*) FROM museum WHERE open_year  >  2013 OR open_year  <  2008;