primary key是什么意思

网络释义

用法例句

This paper deeply researched the norm of database design programming,for example,naming a table selecting primary key,data integrity and parallelism.

就数据库设计编程时应遵循的一些规范,如表的命名、主键的选取、数据完整性及并发性等进行了深入的研究,以提高所开发的数据库系统的可靠性、可维护性及性能。

A method for generating primary key intelligently with sequence and trigger in Oracle database is illustrated in this article.

介绍了一种在Oracle数据库中利用序列和触发器智能生成数据库表主键的方法。

Because the coal caving height is larger in fully mechanized top coal caving mining,thick and hard rock strata at higher position turn into the main key stratum,which have large movement and higher impact energy.

综放工作面开采厚度大,高位厚硬岩层会成为主关键层,其运动幅度大、冲击能量高,发生矿震的可能性与危害性加大。

The main key stratum that is made up of the hard stratum covering over the coal seam has a great influence on rock burst.

煤层上覆坚硬厚层岩层组成的主关键层对冲击矿压的发生具有强烈的影响。

The pivotal using of Primary key in EPDS;

主键约束在数字化前兆数据服务软件中的关键运用

Can't remove unique constraint since it's the primary key of table {0}.

唯一约束是表 {0} 的主键，因此不能移除。

Can't remove unique constraint since it's the primary key of a table.

唯一约束是表的主键，因此不能移除。

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。

Unable to add workflow. The selected table requires a primary key.

无法添加工作流。所选表需要主键。

Primary key column '%s' cannot be excluded from a vertical partition.

主键列 ''%1!'' 不能从垂直分区中排除。

primary key constraint error when creating the new table.

就不会出现主键约束重复的错误。

Chemical bond mainly includes electrovalent bonds, covalent bonds, and metalic bonds.

化学键主要有离子键、共价键、金属键。

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。

Displays Help topics for Microsoft Word

键入或选择关键字以搜索“帮助”主题

You type the recipient's address, press Tab to skip to the Subject field and type a subject.

你先键入收件人地址，然后按Tab键跳至主题字再键入主题。

Several weak molecular interactions responsible for the maintenance of tertiary structure of proteins are covalent, ionic, hydrogen, and hydrophobic or hydrophilic bonds.

一些决定蛋白质三级结构的主要的弱分子作用力为共价键,离子键,氢键,疏水键和亲水键。

Reinforcing inner-party democracy is the key that Chinese democracy builds;

加强党内民主是中国民主建设的关键

Index rebuild is only available for Primary or Unique keys (Foreign keys do not have enforcing indexes).

索引重建仅适用于主关键字或唯一关键字（未强制索引外部关键字）。

Operation manual: Control it control there aren't protagonist key, at jump key, last stoic dartlike weapon Gege shelf W keys empty.

操作指南：左右键控制主角移动，上键跳跃，空格格档W键发射忍者镖。

To select a topic, use the UP or DOWN arrow keys.

若要选择一个主题，请使用向上键或向下键.

Searches for a Help topic by typing or selecting a keyword

通过键入或选择关键词来搜索“帮助”主题

Search for help topic by typing or selecting a keyword

通过键入或选择关键字来搜索帮助主题

Primary key mirror field. This cell contains the most recently retrieved value for the primary database key.

主关键字镜像字段。此单元格含有数据库主关键字的最近检索值。