Question: If there were 14 in 1990 and 6 survived how many were destroyed?
SQL: SELECT "destroyed" FROM "1-1817852-1" WHERE "1990" = 14.0 AND "survived" = 6.0;

Question: If 4 went to iran and the amount that survived was less than 12.0 how many were there in 1990?
SQL: SELECT COUNT("1990") FROM "1-1817852-1" WHERE "to Iran" = 4.0 AND "survived" < 12.0;

Question: If the aircraft was  USSR MiG-25 RB how many were destroyed?
SQL: SELECT "destroyed" FROM "1-1817852-1" WHERE "Aircraft" = 'USSR MiG-25 RB';