查询词典 subschema

This artical is mainly expatiate on the process how foregrounding subschema been designed and run.

本文主要阐述前台管理子模块的设计与实现过程。

Many different sub subschema can be derived from one schema.

在逻辑上和篁上描述数据是不同的。逻辑数据库的描述叫做一个模式。

The schema and the subschema are both used by the database management system the primary function of which is to serve the application programs by execution their data operations.

一个模式是一个所用数据类型的图表，它给出实体。属性和他们之间的特殊的关系，他是一个合适的保存数据项的框架。

The External Layer The external layer or external model is the second layer of abstraction in the database.This layer is composed of the user views discussed earlier, which are collectively called the subschema.

外部层 外部层或外部模型是第二层的抽象数据库这一层是由用户视图，这是先前讨论过的统称为子模式。

We must distinguish between a record type and a instance of the data-item types and record types stored in a database the term subschema refers to an collocation programmer's vies of the data he uses.

如果数据库的作用仅仅是存贮数据，那它的结构将是简单的，大多数复杂性起因于数据必须所表现所存贮各种各样的数据项之间的关系。

The difficulties of encoding barcode PDF417 are introduced, such as compaction mode switching and subschema switching, error correction code calculation.

1引言条码是一组按一定规则排列的条、空符号的组合，用以表示一定的字符、数字及符号信息，这种条空编码组合可以供机器识读。

According to the users' requirement, the system is maded of 4 modules: homepage module、user operation subschema 、manager operation subschema and manager query subschema.

根据用户需求，系统主要分成4大功能模块，分别是首页模块、用户操作子模块、管理员操作子模块、管理查询子模块。

The directive uses the same Object Class Description (as defined in RFC2252) used by the objectClasses attribute found in the subschema subentry, e.g.

该指令使用与子模式子条目中找到的 objectClasses 属性使用相同的属性类型描述（正如 RFC2252 中所定义的相同）。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。