Question: Tell me the model with fuel or propulsion of Diesel and Orion manufacturer in 2005
SQL: SELECT "Model" FROM "2-11903796-2" WHERE "Fuel or Propulsion" = 'Diesel' AND "Manufacturer" = 'Orion' AND "Year" = 2005.0;

Question: Name the sum of quantity for before 2011 model SLF-230
SQL: SELECT SUM("Quantity") FROM "2-11903796-2" WHERE "Year" < 2011.0 AND "Model" = 'SLF-230';

Question: Name the fleet series with a quantity of 5
SQL: SELECT "Fleet series" FROM "2-11903796-2" WHERE "Quantity" = 5.0;