Arbitrary combinations of these operators on the files making up a database can answer a very large number of queries without requiring users to go into one record at a time processing.
组成数据库文件的算子的随机组合在不要求用户一次只能访问一条纪录的情况下应答大量的查询。
Arbitrary combinations of these operators on the files making up a database can answer a very large number of queries without requiring users to go into one record at a time processing.
组成数据库文件的算子的随机组合在不要求用户一次只能访问一条纪录的情况下应答大量的查询。
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