Examine the description of the STUDENTS table:STD_ID NUMBER（4)COURSE_ID VARCHAR2（10)START_DATE DATEEND_DATE DATEWhich two aggregate functions are valid on the START_DATE column？ （）

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  A . SELECT COUNT (*) FROM employees WHERE last _name='smith'; B . SELECT COUNT (dept_id) FROM employees WHERE last _name='smith'; C . SELECT DISTINCT (COUNT (dept_id) FROM employees WHERE last _name='smith'; D . SELECT COUNT (DISTINCT dept_id) FROM employees WHERE last _name='smith'; E . SELECT UNIQE (dept_id) FROM employees WHERE last _name='smith'

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• Examine the description of the STUDENTS table: https://assets.asklib.com/images/image2/2018080115032850512.jpg 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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  A . SELECT COUNT(*) FROM employees WHERE last_name='Smith'; B . SELECT COUNT(dept_id) FROM employees WHERE last_name='Smith'; C . SELECT DISTINCT(COUNT(dept_id)) FROM employees WHERE last_name='Smith'; D . SELECT COUNT(DISTINCT dept_id) FROM employees WHERE last_name='Smith'; E . SELECT UNIQUE(dept_id) FROM employees WHERE last_name='Smith'

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• 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?（）

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