Examine the description of the STUDENTS table: STD_ID NUMBER(4) COURSE_ID VARCHARD2(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 VARCHARD2(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)

出自：Oracle认证

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