CREATE TABLE table_name_78 (total VARCHAR(255), set_1 VARCHAR(255), score VARCHAR(255), date VARCHAR(255))
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"