备用键 meaning in English

alt alternate key

Values by using the alternate keys from
维度表中的备用键来获取
Detailed description of the data items of each data entity is provided , and the primaryalternateforeign keys are also identified and documented
本文件亦会详尽描述每个数据实体的数据项目，并认定及记录其主关键码备用键码外键码。
In sql server distributed queries , the instance of sql server executing the distributed query . the local server then accesses any linked servers referenced in the query
表中的一个候选键由数据库设计器指定为该表的主键，任何其他候选键称为备用键。