foreign database publishers 国外数据库商
China Foreign Economic Database 中国对外经济数据库
Foreign Language Document Collections Database 馆藏西文文献数据库
Foreign Language Periodicals Collections Database 馆藏西文期刊数据库
foreign language database 外文数据库
foreign periodical database 外刊数据库
NSTL Foreign Biomedical Literature Database NSTL外文生物医学文献数据库
This makes importing foreign keys easier in relational database models.
这样使得在关系数据库模型中导入外键更方便。
It is similar to a foreign key in a relational database.
它类似于关系数据库中的外键。
To do so, click on the Add icon, and then select the database object type Foreign Key Constraint, as shown in Figure 4c.
为此，单击add图标，然后选择数据库对象类型Foreign Key Constraint，如图4c所示。
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