CREATE TABLE table_52877 ("Date" TEXT, "Score" TEXT, "Set 1" TEXT, "Set 2" TEXT, "Set 3" TEXT, "Total" TEXT)

What is the Set 2 with a Total of 45 12, and a Set 3 with 15 2?
SELECT "Set 2" FROM table_52877 WHERE "Total" = '45–12' AND "Set 3" = '15–2'
SELECT "Set 2" FROM "table_52877" WHERE "Set 3" = '15–2' AND "Total" = '45–12'