因此，必须收集和分析服务使用统计数据。
Therefore, services usage statistics must be collected and analyzed.
在执行实际的连接操作之前，优化器使用统计数据制定一个查询计划。
The optimizer would chalk out a query plan before performing the actual join operation itself by making use of the statistical data.
学生必须具备以下条件：良好的计算机使用技能，晚上和周末有空，了解篮球规则和统计数据。
Students must meet all of the following requirements: good computer skills, available evenings and weekends, knowing basketball rules and statistics.
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