The point table (wells_pts) has a foreign-key relationship with the source table (wells).
点表（wells_pts）和源表（wells）之间有外键关系。
Understanding these foreign-key definitions is key to understanding the mapping of EJB relationships.
理解这些外键的定义是理解ejb关系映射的关键。
Early enterprise applications used database tables and foreign-key relationships between them to model entities.
早期的企业应用程序使用数据库表和表之间的外键关系进行实体建模。
You can modify the Hibernate cache settings, adjust the fields used for foreign-key associations, and much more.
可以修改Hibernate 的缓存设置，调整外键关联使用的字段，等等。
Since dayTrader-plan.xml did not use the foreign-key-column-on-source element in this relationship, the foreign key should be on the OrderEJB.
因为在此关系中dayTrader-plan.xml没有使用foreign-key-column-on-source元素，所以外键应该在 OrderEJB 上。
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。
Next, select the newly added foreign key constraint in the editor and specify the key columns using the Properties view.
接下来，在编辑器中选择新添加的外键约束，并使用Properties视图指定关键列。
The Location table contains a foreign key (region_id) that corresponds to primary key of the region table.
location表包含一个外键(region_id)对应region表的主键。
For foreign key creation, another table with a primary key with a compatible data type is required.
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。
Alternative way of creating a primary key and foreign key.
另外一种创建主键和外键的方式。
Fortunately, with a basic understanding of the primary key and foreign key strategy employed, you can find anything you want.
幸运的是，随着对使用的主键和外键策略的基本理解，可以找到您所需的全部内容。
You don't need to worry about messing around with the primary key or foreign key.
您无需担心处理主键或外键的麻烦。
Also, notice how the primary key and foreign key properties represent the relationships on the Deals on Wheels class diagram.
此外，注意主键和外来键属性是怎样表达车辆调度类图的关系的。
Data type of primary key columns, foreign key columns, and columns used on indexes.
主键列、外键列和索引上使用的列的数据类型。
You can also establish a foreign key in a secondary table to link with a primary key in a primary table.
您还可以在次表中建立外键，以链接主表中的主键。
Therefore, you need to map the foreign key attribute in Employee to the Department's primary key.
因此您需要将Employee的外部关键字属性，与Department的主关键字映射上。
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.
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。
To do that, we need to make sure that when an XML element can contain a subelement, the subelement contains a foreign key corresponding to the parent's primary key.
要这样做，需要确保当XML元素包含子元素时，子元素包含与父代主键相对应的外键。
You can also use the system catalog views to retrieve information about NOT NULL, unique, primary key, foreign key, and table check constraints. For example.
也可以使用系统编目视图来检索关于NOT NULL、惟一、主键、外键和表检查约束的信息。
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。
In this example, we will use the name C0989623 as the name of the foreign key (Figure 6).
在本例中，我们将使用名称C0989623作为外键的名称(图6)。
For example, this might happen when two ore more of the tables in the MQT have a referential integrity relationship defined and the join predicate is on their primary key - foreign key columns.
例如，当MQT中的两个或多个表定义了引用完整性关系并且联结谓词在它们自己的主键-外键列上时，就会出现这种情况。
Constraints such as primary key - foreign key relationships and uniqueness of values are not possible on particular values of an XML document.
不能对XML文档的特定值执行限制，比如主键—外键关系和值的唯一性。
In addition to the id primary key, you've declared the customer_id column to be a foreign key referencing the customer table.
除了id主键以外，还声明了customer_id列作为引用客户表的外键。
Missing join predicates, but only if a foreign key is defined.
丢失连接谓词，只在定义了外键的情况下。
Create a foreign key to link this new table with the existing employee table.
创建一个外键，以便将这个新表与已有的雇员表相连接。
Minimize the triggers, CHECK and foreign key constraints, and generated columns for the table.
尽量减少表上的触发器、检查和外键约束以及生成的列。
One column links to the form (the row in the table) using a foreign key.
一列使用一个外键链接到表单上(表中的一行)。
Similarly if two tables are connected via a foreign key, they are connected.
与此类似，如果两张表通过一个外键连接起来，我们也称其为连接的。
This makes it virtually impossible for us to create a foreign key.
这使得我们几乎不可能创建外键。
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