• 记录关联关联,存在,没有或者有一个,或者多个记录重要的也是最常见关系

    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.

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  • 而且这种方法在为每个提供完全一致可预测名称以及格式方面有着额外优势

    And the approach has the additional advantage of giving every table's primary key an identical and predictable name and format.

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  • 如果惟一性约束指定了这个,那么允许使用这个子句(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).

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  • 注意企业复制要求所有定义

    Note: Enterprise replication requires that primary keys be defined on all tables.

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  • 数据集描述两个

    The DataSet also depicts the primary keys of the two tables.

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  • 关系其他有关目标数据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.

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  • 复制要求所有节点通过访问节点获得关于字典信息

    Master replicates require all nodes to access the master node to obtain the dictionary information about tables, columns, and primary keys.

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  • 对于创建,则需要另外一个具有,且该主键具有兼容数据类型

    For foreign key creation, another table with a primary key with a compatible data type is required.

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  • 确保每个都有一个

    Make sure each table has a primary key.

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  • 除了具有以外,通常还有一些

    As well as having primary keys, tables typically have some secondary keys.

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  • 数据库生成(通过扩展,为相关生成主键),从而程序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.

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  • 它们逻辑数据模型转换而来,其中实体关系转换以及约束。

    They are transformations of logical data model where the entities and relationships are transformed into tables, columns, primary keys, foreign keys, and constraints.

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  • 它们包含持有者专有名称信息可以作为路由主键

    They contain information in the subject's distinguished name, which can be used as a key into a routing table.

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  • 了解关系数据库数据模型惟一联结

    Learn about relational databases, data models, unique keys, primary keys, foreign keys, and table joins.

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  • 注意这个两个

    Note that this table has two primary keys.

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  • 如果任一缺乏,那么改变,添加充当主键ER影子

    If any of the tables are missing primary keys, those tables are altered to add er shadow column keys that act as primary keys.

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  • 实现更好复制ER要求定义一个

    To help with replication ER requires that the table have a primary key defined.

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  • 星型模式要求生成适当使用事实

    The star schemas require the generation and proper use of primary or foreign keys for the fact and dimension tables.

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  • 索引扫描实际上进行查找完成约束验证

    The latter is actually a primary key lookup against the parent table and constitutes the foreign key constraint verification.

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  • 所有惟一索引必须相关分区集。

    The primary key and any unique index of the table must be a superset of the associated partitioning key.

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  • 与其它中的对应

    The secondary keys correspond with primary keys in other tables.

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  • 维度需要作为数据通用作为事实

    A dimension table needs a generalized key as the primary key data; this becomes the foreign key in the fact table.

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  • 第二个( REF_ESTATE_ID)另外一个的列名。

    The second (REF_ESTATE_ID) is the column name from the other table's primary key.

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  • 如果模板实行中服务器没有这些根据模板定义创建主键

    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.

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  • 否则序列获取一个新的作为中新条目主键事实中的

    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.

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  • 第一(ID)

    The first column (ID) is the primary key of the table.

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  • 通常一个字符串

    The row key is the primary key of the table and is typically a string.

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  • 允许定义惟一

    The keys view allows you to define primary, unique, and foreign keys for the table.

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  • ID标识

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

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  • 首先通常具有一个映射对应数据库(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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