Examine the description of the STUDENTS table: STD_ID NUMBER(4) COURSE_ID VARCHAR2(10) START_DATE DATE END_DATE DATE Which two aggregate functions are valid on the START_DATE column? （ ）A、SUM（start_date）B、AVG（start_date）C、COUNT（start_date）D、AVG（start_date，end_date）E、MIN（start_date）F、MAXIMUM（start_date）
Examine the description of the STUDENTS table: STD_ID NUMBER(4) COURSE_ID VARCHAR2(10) START_DATE DATE END_DATE DATE Which two aggregate functions are valid on the START_DATE column? （ ）
- A、SUM（start_date）
- B、AVG（start_date）
- C、COUNT（start_date）
- D、AVG（start_date，end_date）
- E、MIN（start_date）
- F、MAXIMUM（start_date）
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