So it is obvious that the accuracy of selectivity estimation depends upon how often you run UPDATE STATISTICS.
因此，选择性估算的准确性显然基于您运行UPDATE STATISTICS的频率。
The experimental results show that the method is efficient for selectivity estimation for the distance joins.
实验结果证明该种方法能够有效地进行距离连接选择度估计。
Distance join is widely used in spatial database. Selectivity estimation for distance join is the basis of optimizing the query of the distance.
距离连接在空间数据库中有着广泛的应用，而距离连接的选择度估计是优化距离查询的基础。
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