CREATE TABLE table_name_45 (year VARCHAR2, surface VARCHAR2, score VARCHAR2)

How many years have a Surface of clay, and a Score of 4 : 0?
SELECT COUNT(year) FROM table_name_45 WHERE surface = "clay" AND score = "4 : 0"
SELECT COUNT("year") FROM "table_name_45" WHERE "4 : 0" = "score" AND "clay" = "surface"