7、Because typed tables contain objects that can be referenced by other objects, every typed table must have an object identifier column as its first column.
4、Type a name for the new application policy, and if necessary change the object identifier.
2、An object identifier uniquely identifies an issuance or application policy.
1、digital object identifier
3、Type a name for the new application policy, and then accept or change the object identifier.
6、First, you usually want to have a (surrogate) object identifier that maps to the primary key of the corresponding database table.
5、Application of digital object identifier(DOI) in journals of Chinese Medical Association