examine the description of students table stdid number 4 courseid varchar2..., Oracle SQL 9i, Databases

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Question:Examine the description of the STUDENTS table:
STD_ID    NUMBER (4)
COURSE_ID    VARCHAR2 (10)
START_DATE    DATE
END_DATE    DATE
The aggregate functions valid on the START_DATE columns are:

A SUM(start_date) 
B AVG(start_date) 
C COUNT(start_date) 
D AVG(start_date, end_date) 
E MIN(start_date)

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+ AnswerC E

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Question:Examine the description of the STUDENTS table: STD_ID NUMBER (4) COURSE_ID VARCHAR2 (10) START_DATE DATE END_DATE DATE The aggregate functions valid on the START_DATE columns are:

A SUM(start_date)

B AVG(start_date)

C COUNT(start_date)

D AVG(start_date, end_date)

E MIN(start_date)

C E