Primary key

Null value is not allowed in unique index or primary key.

唯一性索引或主键中不允许有空值。

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this happens when no primary key is defined.

即使没有定义主键，这种操作也会发生。

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the primary key should also have an@ id annotation.

主键也应该有一个@ID注释。

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there is already a primary key in this table's key collection.

该表的关键字集中已有一个主关键字。

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the research on the relational database watermarking based on the virtual primary key

基于虚拟主键的数据库水印技术研究

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an entity class needs a primary key.

Entity类需要一个主键。

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the target table must have a primary key.

目标表必须有一个主键。

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this article described three approaches to implementing a surrogate key as primary key.

本文描述了实现作为主键的代理键的三种方法。

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study on influences of primary key stratum on surface dynamic subsidence

覆岩主关键层对地表下沉动态的影响研究

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research of ejb ′ s primary key generation strategies based on design patterns

基于设计模式的EJB主键生成策略的研究

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Every record in the table has a unique ID called the primary key.

表中的每个记录都有一个惟一的ID，称为主键。

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this becomes the primary key in the physical model.

这成为物理模型中的主键。

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an array of primary key values to test for.

要测试的主键值的数组。

provided by jukuu

It is the primary key technical link in natural language processing. The current technology of Chinese word segmentation is working for Chinese text.

它是自然语言处理过程中首要的技术环节，其重要性不言而喻。目前的中文分词技术主要针对中文文本进行分词。

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setting a field as the primary key automatically defines the field as unique.

将字段设为主键会自动将字段定义成唯一的。

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the fourth implementation uses a sequence to generate a primary key.

用一个序列产生一个关键字。

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choose the cells to be linked to the primary key fields.

选择要链接到主关键字字段的单元格。

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create a relationship between the primary key and foreign key columns.

在主键列和外键列之间创建关系。

provided by jukuu

table doesn't have a primary key.

料表有主索引。

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automatic primary key and unknown primary key generation

自动生成主键和未知的主键

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You must select a primary key field for accessing the database table.

要访问数据库表，必须选择某个主关键字字段。

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you've also identified the id column as the table's primary key.

还将ID列标识为表的主键。

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alternative way of creating a primary key and foreign key

另外一种创建主键和外键的方式

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Click the first icon to add the primary key attribute.

点击工具栏中的第一个图标以添加主属性。

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each table has an id field that serves as the primary key.

每个表有一个用作主键的id字段。

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database watermarking algorithm based on virtual primary key

一种基于虚拟主键的数据库水印算法

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the first column ( id) is the primary key of the table.

第一列（ID）是此表的主键。

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Effects of primary key stratum location on height of water flowing fracture zone

覆岩主关键层位置对导水裂隙带高度的影响

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this field isn't unique, so you can't use it as the primary key.

该字段不是唯一的，所以不能用作主关键字。

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make sure each table has a primary key.

确保每个表都有一个主键。

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