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2. Unique key - Wikipedia

   en.wikipedia.org/wiki/Unique_key

   In this case, the EmployeeID is both a foreign key and the unique primary key, meaning that the tables have a 1:1 relationship. In the case where the person entity contained the biological father ID, the father ID would not be expected to be unique because a father may have more than one child.

3. Unique identifier - Wikipedia

   en.wikipedia.org/wiki/Unique_identifier

   A unique identifier (UID) is an identifier that is guaranteed to be unique among all identifiers used for those objects and for a specific purpose. [1] The concept was formalized early in the development of computer science and information systems. In general, it was associated with an atomic data type.

4. Primary key - Wikipedia

   en.wikipedia.org/wiki/Primary_key

   In the relational model of databases, a primary key is a designated attribute that can reliably identify and distinguish between each individual record in a table.The database creator can choose an existing unique attribute or combination of attributes from the table (a natural key) to act as its primary key, or create a new attribute containing a unique ID that exists solely for this purpose ...

5. Entity–relationship model - Wikipedia

   en.wikipedia.org/wiki/Entity–relationship_model

   Entities and relationships can both have attributes. For example, an employee entity might have a Social Security Number (SSN) attribute, while a proved relationship may have a date attribute. All entities except weak entities must have a minimal set of uniquely identifying attributes that may be used as a unique/primary key.

6. Surrogate key - Wikipedia

   en.wikipedia.org/wiki/Surrogate_key

   A surrogate key (or synthetic key, pseudokey, entity identifier, factless key, or technical key [citation needed]) in a database is a unique identifier for either an entity in the modeled world or an object in the database. The surrogate key is not derived from application data, unlike a natural (or business) key. [1]

7. Hi/Lo algorithm - Wikipedia

   en.wikipedia.org/wiki/Hi/Lo_algorithm

   This implementation uses hi/lo algorithm to generate identifiers. Algorithm uses a high value retrieved from database and combines it with range of low values to generate a unique identifier. High value is from column next_id of table hibernate_unique_key by default. But you can override this to use a different table.

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   mail.aol.com

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9. Service number (United States Coast Guard) - Wikipedia

   en.wikipedia.org/wiki/Service_number_(United...

   In June 2004, the Coast Guard completed a program to have only an Employee Identification number (EMPLID) appear on Coast Guard Leave and Earnings Statements and other documents not requiring a Social Security number. The format for all EMPLID numbers is a seven digit number where the first digit is 1 and there are no alpha characters used.