Question: Which average Opened has a Manufacturer of Vekoma?
SQL: SELECT AVG("Opened") FROM "2-1520959-1" WHERE "Manufacturer" = 'Vekoma';

Question: Which Opened is the highest one that has a Themed Area of Aerial Park, and a Manufacturer of Zamperla?
SQL: SELECT MAX("Opened") FROM "2-1520959-1" WHERE "Themed Area" = 'Aerial Park' AND "Manufacturer" = 'Zamperla';

Question: Which Themed Area has a Name of Troublesome Trucks Runaway Coaster?
SQL: SELECT "Themed Area" FROM "2-1520959-1" WHERE "Name" = 'Troublesome Trucks Runaway Coaster';

Question: Which Manufacturer has a Style of Steel Sit Down, and an Opened larger than 2008?
SQL: SELECT "Manufacturer" FROM "2-1520959-1" WHERE "Style" = 'Steel Sit Down' AND "Opened" > 2008.0;