在本例中，EMPNO是表的唯一键。
即它在一个唯一键组合上只会产生一行数据。
That is it only brings in one row of data for a unique key combination.
但和数据库不同的是，本地的唯一键还不行。
Unlike in the case of a database, however, a locally unique key will not do.
索引并不只是为了主键或者唯一键。
Indexes are not just for the primary keys or the unique keys.
每个扩展需要一个唯一键用于在字典中保存状态。
Each extension should use a unique key to use to store state in the dictionary.
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.
模式不需要明确指定一列是主键或唯一键来产生星型连接计划。
The schema does not need to specify explicitly that a column is a primary or unique key to produce a star join plan.
使用此对话框可以创建或修改索引、主键和唯一键。
Use this dialog box to create or modify indexes, primary keys, and unique keys.
无法保证RPG程序正在 CHAIN 上使用一个唯一键。
There is no guarantee that the RPG program is using a unique key on the CHAIN.
getCatalogKey：用于将选择条件转换为一组唯一键。
GetCatalogKey : Used to convert the selection criteria to a set of unique keys.
对于实体类，必须至少有一个成员具有此特性，并应映射到相应表或视图中的主键或唯一键。
For an entity class, at least one member must have this attribute and should be mapped to the primary key or a unique key in the corresponding table or view.
否则，如果全文唯一键的大小超过所允许的最大值(900个字节)，全文填充将无法继续进行。
Otherwise, if the full-text unique key size exceeds the maximum size allowed (900 bytes), full-text population will not be able to proceed.
ODBCAccess属性 "Generateuniquekeys inindex"为数据库交互性提供唯一键。
The ODBC Access property "Generate unique keys in index" provides a unique key for database interactivity.
ODBCAccess属性 "Generateuniquekeys inindex"为数据库交互性提供唯一键。
The ODBC Access property "Generate unique keys in index" provides a unique key for database interactivity.
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