The customer product number and the operator suppose in advance in the parameter establishment, prepares the transfer inquiry.
客户产品号和操作员在参数设置内预设，以备调用查询。
Almost all in operator child inquiry ADAPTS be use EXISTS child inquiry.
几乎将所有的IN操作符子查询改写为使用EXISTS的子查询。
Secondly, the transfer operator is designed and the judgment method of optimum inquiry standard is given.
其次设计了换乘算子并给出最优查询标准判断方法；
Secondly, the transfer operator is designed and the judgment method of optimum inquiry standard is given.
其次设计了换乘算子并给出最优查询标准判断方法；
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