CREATE TABLE table_name_7 (began_operation INT, length__km_ VARCHAR, stations VARCHAR)

When is the earliest began operation with a length of sultan ismail and over 27 stations?
SELECT MIN(began_operation) FROM table_name_7 WHERE length__km_ = "sultan ismail" AND stations > 27
SELECT MIN("began_operation") FROM "table_name_7" WHERE "length__km_" = "sultan ismail" AND "stations" > 27