Complete normalization is also avoided if this would require duplication of an expensive predicate (for example, a quantified subquery predicate).

 
  • 如果完全的規范化需要復制占用大量資源的謂語(yǔ)(例如定量的子查詢(xún)謂語(yǔ)),則還將避免完全的規范化。
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