Query processing is one of the key techniques in HIIS, and query decomposition, scheduling and optimization are the central problems for query processing.
查询优化是异构信息集成系统中非常重要而又十分复杂的问题。
Query processing is one of the key techniques in HIIS, and query decomposition, scheduling and optimization are the central problems for query processing.
查询优化是异构信息集成系统中非常重要而又十分复杂的问题。
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