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

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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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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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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an entity class needs a primary key.

Entity类需要一个主键。

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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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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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table doesn't have a primary key.

料表有主索引。

provided by jukuu

the primary key should also have an@ id annotation.

主键也应该有一个@ID注释。

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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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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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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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make sure each table has a primary key.

确保每个表都有一个主键。

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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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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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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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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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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

an array of primary key values to test for.

要测试的主键值的数组。

provided by jukuu

this becomes the primary key in the physical model.

这成为物理模型中的主键。

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