SCHEMA:
CREATE TABLE table_name_68 (draws INTEGER, south_west_dfl VARCHAR, byes VARCHAR)
USER:
What is the lowest value for Draws, when South West DFL is "Tyrendarra", and when Byes is greater than 0?

QUERY:
SELECT MIN(draws) FROM table_name_68 WHERE south_west_dfl = "tyrendarra" AND byes > 0