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Oracle认证考试

睦霖题库>其他计算机考试>Oracle认证考试

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)
正确答案:C,E
答案解析:
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