CREATE TABLE table_name_15 (model VARCHAR, total_produced VARCHAR, prime_mover VARCHAR)

What model has a total produced more than 5 and a prime move of 12-251c?
SELECT model FROM table_name_15 WHERE total_produced > 5 AND prime_mover = "12-251c"
SELECT "model" FROM "table_name_15" WHERE "12-251c" = "prime_mover" AND "total_produced" > 5