It can be used to generate unique values for the surrogate key column.
我们可以使用该函数为代理键列生成惟一值。
Rails USES the primary key column id for various recordkeeping and referencing tasks.
Rails使用主键列id来完成各种记录保持和引用任务。
If the join key is a composite key, each key column must be prefixed with the PRIOR operator.
如果联接键是一个复合键，那么必须使用PRIOR运算符为每个键所在的列加上前缀。
In Listing 5, you have a standard primary key column called PO_ID (that is, purchase order ID).
在清单5中，您有一个称为PO_ID的标准主键列(即订单id)。
In this form, we can tell Domino which field is the key field and how this field maps to the DB2 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。
The application never knows what value is put into the primary key column after running the INSERT statement.
在运行insert语句之后，应用程序将永远都不知道放入了主键列中的是什么值。
Gets the name, row size, number of rows, number of columns, and key column index of the specified table.
取得指定之资料表的名称、资料列大小、资料列数目、资料行数目和索引键资料行索引。
In order to use this technique, the SQL must provide a predicate on the first key column of the partitioning index.
为了使用这种技术，SQL必须提供分区索引的第一个键列上的一个谓词。
The XML Input stage uses a Key column to identify the repetition element, which determines how the XML data is generated.
XMLInput阶段使用Key列标识重复元素，这决定如何生成 XML数据。
It sets up two accessors: accessor 0 contains only the primary key column (ID) and accessor 1 contains other columns.
它设置两个访问器：访问器0仅包含主键列id，访问器1包含其他列。
In this type of table, you define a primary key column, a MIME type column, and one or more generic columns as BLOB data.
在这种类型的表中，你定义了一个主键列，一个MIME类型列，和一个或多个通用列用来表示BLOB数据。
Although a 900-byte column is supported, we do not recommend building a full-text index that USES a key column of that size.
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。
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.
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。
The member key column for the lowest level of the dimension must contain the keys that relate the fact table and the dimension table.
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。
You also want to be able to write data to all the columns except the primary key (because you cannot write to the primary key column).
还希望能够将数据写入除主键外（因为不能向主键列写入）的所有列。
In the Configure property parameters for EGL Application transformation section, select the Is Key Column checkbox, as shown in figure 12.
在EGLApplication转换部分的Configure属性参数中选择IsKey Column复选框，如图12所示。
In the Configure property parameters for EGL Application transformation section, select the Is Key Column checkbox, as shown in figure 11.
在Configurepropertyparametersfor EGLApplicationtransformation部分，选择IsKey Column复选框，如图11所示。
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.
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。
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.
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。
An inner join is essentially the intersection of two tables, where the tables are matched by comparing the values of a key column, such as itemNumber.
内连接实际上是两个表的交集，它通过比较关键列(比如itemnumber)的值来匹配表。
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.
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。
Alternatively, you could define the primary key to use Identity value generation at the time you were defining the table and adding the primary key column itself.
您还可以选择，定义主键值，来在定义表格和添加主键值列本身时使用identity值生成。
The <many-to-many> tag's column attribute specifies the foreign key column in the link table that relates the link table to the mapping table for the target class.
<many-to-many>标签中的column属性用来指定连接表与目标类的映射表链接的外键。
If you know the primary key information at design time, we recommend that you explicitly specify the primary key column or columns in order to achieve optimal performance.
如果您在设计阶段就已知道主索引键资讯，建议您明确地指定主索引键资料行，以达到最佳效能。
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。
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.
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。
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.
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。
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.
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。
If informational check constraints exist on the primary key column, you should explicitly specify informational check constraints on their corresponding foreign key columns. For example.
如果在主键列上存在信息检查约束，那么应该在它们相应的外键列上指定信息检查约束。
For each column in the partitioning key of the joined tables, an equijoin predicate must exist.
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。
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