However, in the absence of data distributions, the database server calculates selectivity for filters of different types based on table indexes.
但是，如果没有数据分布，则数据库服务器根据表索引计算不同类型的过滤器的选择率。
The distributions have a close relation with bed rock property, littoral zone types, geography, water systems, hydraulic conditions and bed property of sea bottom.
砂矿的分布与滨海带的基岩性质、海岸带类型、地貌、水系、水动力条件、海底底质等密切相关。
The concept, types and distributions of subtle reservoirs developed in Taibei sag are analyzed and dis-cussed.
分析并探讨了台北凹陷隐蔽油气藏发育的概念类型与分布。
Topographic features as well as types and distributions of sediments in Qingdao coast zone and adjacent sea areas are introduced by the authors.
研究了青岛海岸带及邻近海域的地形特征、沉积物类型及分布特征。
Objective: To research the types, the distributions for gender and age, and the hereditary mode of the petaloid toenails.
目的探讨瓣状甲的类型、性别和年龄分布及其遗传方式。
The typical soil types in Kaiyang region, Guizhou Province were selected as investigative objects, and the concentrations and distributions of Se in soils were studied.
以贵州开阳地区典型土壤为对象，研究了开阳地区土壤中硒元素的含量、分布及影响因素。
You can learn about the data generation process, the types of data generator extensibility, and the relationships between data generators, data distributions, and data generator designers.
可以了解数据生成过程、数据生成器扩展性的类型以及数据生成器、数据分布与数据生成器设计器之间的关系。
This paper analyzes and discusses the distributions, types and geological structures of the 13 reservoir-induced earthquakes in China.
本文对中国13座水库诱发地震的分布、地质构造背景和诱发地震类型进行了分析讨论。
Certain slope-break zone types indicate the activities and distributions of syn-depositional faults and control sediment dispersal and sand body accumulation.
特定的坡折带类型揭示了同沉积断裂的活动和分布特征，制约着沉积物的分散过程和砂体堆积。
The authors have proved that the two types of definitions are congruous by using limit theory, while discussing the correlation among the subclasses of heavy-tailed distributions.
利用分析中的极限理论等方法，证明了重尾分布的这两种定义是一致的，并给出了重尾分布子族间的相互关系。
The distributions of flux and loss of two types of transformer cores with different mitred overlap coner joints and T-joints are obtained by the method.
文中计算了两种不同T-接型式变压器铁心的磁通和损耗分布。
The authors have proved that the two types of definitions are congruous by using limit theory while discussing the correlation among the subclasses of heavy-tailed distributions.
利用分析中的极限理论等方法，证明了重尾分布的这两种定义是一致的，并给出了重尾分布子族间的相互关系。
The types, characteristics and distributions of the coastal wetlands of China are analyzed.
对我国海岸湿地类型、特点和分布进行了论述。
The distributions of macrobenthos are closely related to waters' temperature. salinity, sediment types and sheltered degree of bay.
底栖生物的分布与水域盐度、温度、底质性质、海湾屏蔽度有密切的关系。
Based on a large number of calculated results, a simplified method applicable to these three types of structures for analyzing the earthquake actions and their distributions are presented.
通过大量计算，文中推荐了剪切型、剪弯型及弯曲型结构地震作用及其分布的简化分析方法。
The distributions of various types of ametropia in different decades were counted up and compared.
对各种屈光类型不同年代的构成进行比较。
The distributions of various types of ametropia in different decades were counted up and compared.
对各种屈光类型不同年代的构成进行比较。
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