主键表的一个记录，关联到关联表中，存在，没有，或者有一个，或者多个记录。这是最重要的也是最常见的关系。
The primary key table contains only one record that relates to none, one, or many records in the related table. This is the most commonly used type of relationship.
而且这种方法在为每个表的主键提供完全一致和可预测的名称以及格式方面有着额外的优势。
And the approach has the additional advantage of giving every table's primary key an identical and predictable name and format.
如果表的主键或惟一性约束中指定了这个列，那么不允许使用这个子句(SQLSTATE 42831)。
This clause is not allowed if the column is specified in the primary key, or in a unique constraint of the table (SQLSTATE 42831).
注意：企业复制要求在所有表上定义主键。
Note: Enterprise replication requires that primary keys be defined on all tables.
该数据集还描述了这两个表的主键。
The DataSet also depicts the primary keys of the two tables.
表间关系、主键列和其他有关目标数据的信息也是通过元数据对象指定的。
Inter-table relationships, primary key columns, and other information about the target data is specified through the metadata object as well.
主复制要求所有节点通过访问主节点来获得关于表、列和主键的字典信息。
Master replicates require all nodes to access the master node to obtain the dictionary information about tables, columns, and primary keys.
对于创建外键，则需要另外一个具有主键的表，且该主键具有兼容的数据类型。
For foreign key creation, another table with a primary key with a compatible data type is required.
确保每个表都有一个主键。
除了具有主键以外，表通常还有一些辅键。
As well as having primary keys, tables typically have some secondary keys.
数据库为一个表格的主键生成值(通过扩展，为相关表生成外主键)，从而将程序从这项任务的重担中解放出来。
Having the database generate values for the primary key for a table (and by extension, any foreign key values for related tables) eliminates the burden from the application from having to do so.
它们由逻辑数据模型转换而来，其中实体和关系转换为表、列、主键、外键以及约束。
They are transformations of logical data model where the entities and relationships are transformed into tables, columns, primary keys, foreign keys, and constraints.
它们包含了持有者的专有名称的信息，可以作为路由表的主键。
They contain information in the subject's distinguished name, which can be used as a key into a routing table.
了解关系数据库、数据模型、惟一键、主键、外键和表联结。
Learn about relational databases, data models, unique keys, primary keys, foreign keys, and table joins.
注意这个表有两个主键。
如果任一表缺乏主键，那么该表将被改变，以添加充当主键的ER影子列键。
If any of the tables are missing primary keys, those tables are altered to add er shadow column keys that act as primary keys.
要实现更好的复制，ER要求表定义一个主键。
To help with replication ER requires that the table have a primary key defined.
星型模式要求生成并适当使用事实表和维表的主键或外键。
The star schemas require the generation and proper use of primary or foreign keys for the fact and dimension tables.
索引扫描实际上是对父表进行主键查找，并完成外键约束验证。
The latter is actually a primary key lookup against the parent table and constitutes the foreign key constraint verification.
表的主键和所有惟一索引都必须是相关分区键的超集。
The primary key and any unique index of the table must be a superset of the associated partitioning key.
辅键与其它表中的主键对应。
The secondary keys correspond with primary keys in other tables.
维度表需要作为主键数据的通用键；这将作为事实表的外键。
A dimension table needs a generalized key as the primary key data; this becomes the foreign key in the fact table.
第二个（ REF_ESTATE_ID）是另外一个表的主键的列名。
The second (REF_ESTATE_ID) is the column name from the other table's primary key.
如果在模板的实行中服务器上没有这些表和主键，则根据模板定义创建表和主键。
If the tables and primary keys do not exist on the server during the realization of the template, then the tables and primary keys are created according to the template definitions.
否则，从序列获取一个新的键值，用它作为维表中新条目的主键和事实表中的外键。
Otherwise, a new key value is taken from the sequence and used for both, a new entry in the dimension table and as a foreign key in the fact table.
第一列(ID)是此表的主键。
行键是表的主键，通常是一个字符串。
The row key is the primary key of the table and is typically a string.
允许您定义表的主键、惟一键和外键。
The keys view allows you to define primary, unique, and foreign keys for the table.
还将ID列标识为表的主键。
You've also identified the id column as the table's primary key.
首先，您通常要具有一个映射到对应数据库表主键的(代理)对象标识符。
First, you usually want to have a (surrogate) object identifier that maps to the primary key of the corresponding database table.
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