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Oracle认证考试

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Which three statements about subqueries are true?()

  • A、A single row subquery can retrieve only one column and one row.
  • B、A single row subquery can retrieve only one row but many columns.
  • C、A multiple row subquery can retrieve multiple rows and multiple columns.
  • D、A multiple row subquery can be compared by using the ">" operator.
  • E、A single row subquery can use the IN operator.
  • F、A multiple row subquery can use the "=" operator.
正确答案:B,C,D
答案解析:
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