How to set primary key with duplicate values based on main primary key?
如何基于主密钥重复值，主键设置？
You can drag and drop fields to make new tables, and to move fields between tables. You can also rename the tables, and set primary key fields.
既可以拖放字段形成新表，也可以在两表之间移动字段，还可以重命名表和设置主键字段。
An entity's primary key is the attribute or set of attributes that distinguish one instance of the entity from another.
实体的主键是使该实体的一个实例区别于其他实例的一个或一组属性。
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