选择包含键列的表，然后选择键列。
Select the table which contains the key column, then select the key column.
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.
具有许多键列的索引称为宽索引。
选择包含键列的表，然后选择键列。
具有可变长度的索引键列。
TP只对那些包括表分区键列的查询有利。
TP will only benefit those queries that include the table partitioning key column.
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.
这两个表通过一个共同的键列(ID)进行联结。
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.
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.
如果使用以上CSV文件根据国家缩写检索一个国家名，您可以设置查找来使用列1作为键列，并将列0作为值列。
If using the above CSV file to retrieve a state name based on a state abbreviation, you can set up the lookup to use column 1 as the key column and column 0 as the value column.
如果DOCUMENTS表有一个 user_id 外键列，则文档模型为 belongs_to :user。
The document model belongs_to :user if the DOCUMENTS table has a user_id foreign key column.
如果DOCUMENTS表有一个 user_id 外键列，则文档模型为 belongs_to :user。
The document model belongs_to :user if the DOCUMENTS table has a user_id foreign key column.
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