Which three statements are true regarding B-tree indexes?

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  • A、non-unique index uses the rownum to determine the collating sequence for duplicate keys.
  • B、A unique index used the rownum to determine the collating sequence for duplicate keys.
  • C、A non-unique index uses the rowid to determine the collating sequence for duplicate keys.
  • D、Leaf blocks are linked in a backward collating sequence.
  • E、A unique index uses the rowid to determine the collating sequence for duplicate keys.
  • F、Leaf blocks are linked in a forward collating sequence.
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