this happens when no primary key is defined.

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。

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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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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。

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an array of primary key values to test for.

要测试的主键值的数组。

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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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these plastics can resist the action of acids.

这些塑料不受酸的腐蚀。

词典精选例句