1.And the result shows that this optimal strategy can improve query performance saliently if the query constraint expression is not a CNF.
结果表明，当查询条件不是合取范式时，该优化策略明显提高了查询性能。
2.And the result shows that this optimal strategy can improve query performance saliently if the query constraint expression is not a CNF.
结果表明，当查询条件不是合取范式时，该优化策略明显提高了查询性能。