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计算字段
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  calculated fields
     This paper introduces the method to display the fields come from more than one table in TDBGrid data control component in which using calculated fields, lookup fields and TQuery component.
     本文介绍了利用计算字段、查找字段和TQuery组件在数据库维护控件TDBGrid中显示源自多于一个表的字段的方法。
短句来源
  calculated field
     It also presents the means to realize real-time data transferring by utilizing database view's components to activate the operation of "inserting macro" and the method to judge and handle automatically by applying the function calculated field value in the query and so on.
     同时,提出利用数据库视图的控件来触发"追加记录宏"操作的方法实现数据实时过账及应用查询中函数计算字段值进行自动判断处理等方法。
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  相似匹配句对
     We also give a new correction factor to simplify the calculation of the Unstatistic.
     的计算
短句来源
     Calculation of Skewed Plates
     斜板的计算
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     The Calculation of the Addresses of Fields of DBF file in PASCAL Language
     用PASCAL语言计算数据库文件各字段的内存地址
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  calculated fields
Four statistical ensembles of the AGCM simulations with and without volcanic aerosols over a period of 5 years following the eruption have been made, and the calculated fields have been compared to available observations.
      
???Automatically calculated fields speed up the examination.
      
Solutions are presented for both vector- and 3D-representations of the calculated fields.
      
The strongest calculated fields of the O- probe were found near Asp 25 for both structures.
      
The first-seen and lowest-lying loops are sheared with respect to the calculated fields.
      
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  calculated field
It is found that a calculated field at which relaxation oscillations arise agrees with the measured one.
      
It is shown that a relative rms error involved in the calculated field intensity of no higher than 10-4 is easy to achieve.
      
The calculated field exhibits a complex structure; a relevant feature of it consists in the appearance in the liquid of potential minima which correspond either to substitutional or to interstitial positions in the growing lattice.
      
The calculated field induced structures exhibit a plateau of the apparent tilt angle at , where is the tilt angle of the molecules in the ferriphase.
      
The calculated field was discussed in terms of the binding of cystatin to papain.
      
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This paper introduces the method to display the fields come from more than one table in TDBGrid data control component in which using calculated fields, lookup fields and TQuery component.

本文介绍了利用计算字段、查找字段和TQuery组件在数据库维护控件TDBGrid中显示源自多于一个表的字段的方法。

This paper proposes a way to create data model by use of a semantic database model, which is more close to the feeling of the users. This model is more objective for description of the issue space, and it is more convenient and more normalized to be converted into relation schema. It also presents the means to realize real-time data transferring by utilizing database view's components to activate the operation of "inserting macro" and the method to judge and handle automatically by applying the function calculated...

This paper proposes a way to create data model by use of a semantic database model, which is more close to the feeling of the users. This model is more objective for description of the issue space, and it is more convenient and more normalized to be converted into relation schema. It also presents the means to realize real-time data transferring by utilizing database view's components to activate the operation of "inserting macro" and the method to judge and handle automatically by applying the function calculated field value in the query and so on.

该文提出采用一种更接近用户感觉的"语义对象模型"来创建数据模型,这种模型对问题空间的描述更客观,转换为关系模式更容易、更规范。同时,提出利用数据库视图的控件来触发"追加记录宏"操作的方法实现数据实时过账及应用查询中函数计算字段值进行自动判断处理等方法。

Self-managing and self-optimizing is currently a hot research field in database.To guarantee the accuracy of the estimates made by optimizer,this paper proposed a new method named COCA(entropy-COrrelated-Coefficient-based Auto-detection of association).In comparison with CORDS,COCA has the following features:(1) Fewer limitations.It overcomes the limitation that Chi-square test needs at least 80% of the cells in the contingency table have frequencies greater than 5.(2) More results.CORDS can tell the correlation...

Self-managing and self-optimizing is currently a hot research field in database.To guarantee the accuracy of the estimates made by optimizer,this paper proposed a new method named COCA(entropy-COrrelated-Coefficient-based Auto-detection of association).In comparison with CORDS,COCA has the following features:(1) Fewer limitations.It overcomes the limitation that Chi-square test needs at least 80% of the cells in the contingency table have frequencies greater than 5.(2) More results.CORDS can tell the correlation between columns,while COCA can further discern the specific association degree for both directions.Experiments show that COCA is more robust and produces more statistical information,which is supportive to the creation of more effective and efficient histograms.

数据库自管理、自调优中查询计划的自动优化是目前的关注热点。为保证优化器估值精度,用统计学方法,给出了一种基于熵相关系数的对字段关联性的自动判别的新算法———COCA。该算法有下列特点:(1)限制少,没有卡方检验的频数限制,卡方检验只有在列联表中至少有80%的格子频数大于5的情况下才可信;(2)结果多,卡方检验(CORDS)只判断字段之间是否有关联,新方法可计算字段之间双向的关联程度。实验表明,新方法更坚固,产生更多的统计信息,可以支持后面更高效、准确地建立直方图。

 
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