CREATE TABLE table_name_24 (year_set VARCHAR2, long_course_short_course VARCHAR2, time VARCHAR2)

What year did a short course have a time of 7:51.80?
SELECT COUNT(year_set) FROM table_name_24 WHERE long_course_short_course = "short course" AND time = "7:51.80"
SELECT COUNT("year_set") FROM "table_name_24" WHERE "7:51.80" = "time" AND "long_course_short_course" = "short course"