Question: What is the average total produced when the prime mover is 12-251C?
SQL: SELECT AVG("Total produced") FROM "2-1257252-6" WHERE "Prime mover" = '12-251C';

Question: What is the build date when total produced is 2?
SQL: SELECT "Build date" FROM "2-1257252-6" WHERE "Total produced" = 2.0;

Question: What is the smallest total produced with a model of M-420?
SQL: SELECT MIN("Total produced") FROM "2-1257252-6" WHERE "Model" = 'M-420';

Question: What is the prime mover for a build date in 1975?
SQL: SELECT "Prime mover" FROM "2-1257252-6" WHERE "Build date" = '1975';

Question: What model has a total produced more than 5 and a prime move of 12-251C?
SQL: SELECT "Model" FROM "2-1257252-6" WHERE "Total produced" > 5.0 AND "Prime mover" = '12-251C';