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Oracle认证考试

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Which four statements correctly describe functions that are available in SQL?()

  • A、INSTR returns the numeric position of a named character.
  • B、NVL2 returns the first non-null expression in the expression list.
  • C、TRUNCATE rounds the column, expression, or value to n decimal places.
  • D、DECODE translates an expression after comparing it to each search value.
  • E、TRIM trims the heading of trailing characters (or both) from a character string.
  • F、NVL compares two expressions and returns null if they are equal, or the first expression of they are not equal.
  • G、NULLIF compares twp expressions and returns null if they are equal, or the first expression if they are not equal.
正确答案:A,D,E,G
答案解析:
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