Table schema:
CREATE TABLE table_name_78 (total VARCHAR, set_1 VARCHAR, score VARCHAR, date VARCHAR)

Question: What is the Total with a Score of 3–0, and a Date of 14 oct, and has a Set 1 of 15–12?
SQL: SELECT total FROM table_name_78 WHERE score = "3–0" AND date = "14 oct" AND set_1 = "15–12"