Which two aggregate functions are valid on the START_DATE column if we examine the description of the STUDENTS table:STD_ID NUMBER(4) COURSE_ID VARCHAR2(10) START_DATE DATE END_DATE DATE?
COUNT is used for counting, not aggregating. It counts rows, not columns. You could syntax it like count(*), count(1) or count(100), it still would give you the same result. Crappy question... again