该定义中使用的列被称为表分区键列。
The columns used in this definition are referred to as the table partitioning key columns.
选择包含键列的表，然后选择键列。
我们可以使用该函数为代理键列生成惟一值。
It can be used to generate unique values for the surrogate key column.
索引键列可以包括固定长度和可变长度列。
The key columns of an index can include fixed-length and variable-length columns.
对于分区索引，建议选择不大可能改变的键列。
For partitioning indexes, it is recommended that you choose key columns that are unlikely to be changed.
主键列、外键列和索引上使用的列的数据类型。
Data type of primary key columns, foreign key columns, and columns used on indexes.
常见的替代项包括索引列或其他唯一键列的群集。
Common alternatives include clustering index columns or other unique key columns.
与之相反，当记录被添加到父表的键列时，不执行检查。
In contrast, no checking is performed when records are added to the key columns of a parent table.
同样，键列的数量及其类型以及坐标列的类型也可能不一样。
Likewise, the number of key columns and their types will vary, as will the types of the coordinate columns.
我们可以使用随机化的索引键列来减少争用，但这有何代价呢？
We can use randomized index key columns to reduce contention, but at what cost?
对应着维度最低级别的成员键列必须包含关联事实表和维度表的键。
The member key column for the lowest level of the dimension must contain the keys that relate the fact table and the dimension table.
注意，这假设从不更新键列；一旦一行存在了，它的主键值就不变了。
Note that this assumes that key columns are never updated; once a row exists, it is immutably tied to its primary-key value.
这些注释用于定义组合键列：分别是“STREET”和“CITY”。
These annotations are used to define the composite key columns: "STREET" and "CITY" respectively.
相对于通过键列跨不同的表链接不同行，最佳实践将是在一行中有许多列。
The best practice is to have many columns in a row, as opposed to linking different rows across different tables via key columns.
在PATH辅助索引中，路径值和节点值是用于提高路径搜索效率的键列。
In the path secondary index, the path and node values are key columns that allow efficient seeks when searching for paths.
即使支持900字节的列，也不建议您使用这么大的键列来创建全文索引。
Although a 900-byte column is supported, we do not recommend building a full-text index that USES a key column of that size.
概念模型中的关联是一些属性表示基础数据库中的主键列和外键列的类型。
Associations in the conceptual model are types whose properties represent primary and foreign key columns in the underlying database.
两个表之间的关系通过指定链接表的键列来定义，最常见的常规关系比如“客户-订单”。
A relation is defined between two tables by specifying key columns that link the tables, most commonly regular relations such as customer-to-orders.
当在CSV文件中执行一个查找时，属性允许您指定将哪个列用作键列，以及将哪个列用作值列。
When doing a lookup in a CSV file, the properties allow you to specify which column is used as the key column, and which is used as the value column.
但是请注意，我们不能修改您声明的主键列或任何其他的键列；在本例中，EMP _ ID是主键列。
Note, however, that we cannot update the primary key columns or any other key columns that you declare; in this case, EMP_ID is a primary key column.
在该表单中，我们可以告诉Domino哪个字段是关键字段，以及如何将该字段映射到DB 2键列。
In this form, we can tell Domino which field is the key field and how this field maps to the DB2 key column.
索引下推只需要事实表的单列索引，虽然在所需的外键列是索引的第一个键的情况下可以使用多列索引。
Index push-downs require only a single-column index on the fact table, although they can use a multi-column index if the required foreign-key column is the first key in the index.
另外，在查询重写状态下，修改SELECT来摆脱一个范围型谓词，可以通过提高索引键列匹配增强性能。
Also in the query rewrite vein, modifying a SELECT to get rid of a range-type predicate can increase performance by improving index key column matching.
运行rakedb:migrate以创建SUBSCRIPTIONS表并将外键列添加到SUBJECTS 中。
Run rake db:migrate to create the SUBSCRIPTIONS table and add foreign key columns to SUBJECTS.
在(图21的)Box1中，您需要选择Company .nsf应用程序中的关键字段，并将之映射到DB 2中的键列。
In the Box 1 (of Figure 21), you will need to select the key field in Company.nsf application and map it to the key column in DB2.
MMORPG的标准已经建立得相当充分了，我们也不想过于远离这些标准，例如玩家会希望技能键列能够被安排在相近的键位上。
MMORPG standards are well established, and we did not want to stray far from those; players expect to have the ability buttons mapped close to associated keys, for example.
使用Indexorprimarykey字段来选择键列，QApply程序用以识别复制的行以及正确命令事务。
Use the Index or primary key field to select the key columns that the Q Apply program uses to identify replicated rows and correctly order transactions.
DurationLabel：如果分区键列的数据类型是日期、时间或时间戳，这个参数指定与Constan t值相关的时间单位。
DurationLabel: Identifies the duration that is associated with the Constant value specified if the partitioning key column has been assigned a date, time, or time stamp data type.
关系数据库使用结构化查询语言(Structured Query Language,SQL)以便从多个表和列中提取信息，但是键值存储仅限于对键列的操作。
Relational databases use Structured Query Language (SQL) to pull information from multiple tables and columns, but key-value stores are limited to operations on the key column.
对于被合并的表的分区键内的每列，必须存在一个同等连接的谓语。
For each column in the partitioning key of the joined tables, an equijoin predicate must exist.
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