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Oracle认证考试

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Examine the description of the STUDENTS table: 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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