Which two statements

题目

Which two statements are true regarding subqueries? ()

  • A、A subquery can retrieve zero or more rows 
  • B、Only two subqueries can be placed atone level 
  • C、A subquery can be used only in SQL query statements 
  • D、A subquery can appear on either side of a comparison operator 
  • E、There is no limit on the number of subquery levels in the WHERE clause of a SELECT statement 
参考答案和解析
正确答案:A,D
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