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Surrogate Key:
Surrogate keys are keys that have no "business" meaning and are solely used to identify a record in the table. Such keys are either database generated (example: Identity in SQL Server, Sequence in Oracle, Sequence/Identity in DB2 UDB etc.) or system generated values (like generated via a table in the schema).
Natural Key:
Keys are natural if the attribute it represents is used for identification independently of the database schema. What this basically means is that the keys are natural if people use them example: Invoice-Numbers, Tax-Ids, SSN etc.
What else can I help you with?
Types of keys in database management system?
super key foreign key candidate key surrogate key unique key alternate key composite key compound key
What is the difference between Primarey key and Forn Key?
establishing a relation between two tables called fornkey.......the colum name should be unique is called "primary key"...a table contain only one primary key...a table contain more then one fornkey....
How do you apply a foreign key in a database?
The foreign key is a reference to a key (identifier) of a row in another or even the same table. When the foreign key is not null, it implies that there's an entry in the referenced table with that identifier. The syntax depends on wich database are you using, check the page in the related links below.
What is the difference between http1.0 and http1.1 version?
salam http 1.0 establishes a TCP connection for each packet http 1.1 uses only one connection for all packets
What is difference between WEP 64 and WEP 128?
The 64 bit WEP key uses a 40 bit (10 Hex character) Encryption and a128 bit WEP key uses a 104 bit (26 Hex Character) Encryption.So the 128 bit WEP key is a higher level of encryption compared to 64 bit WEP.
What is a surrogate key and when should you use one?
A surrogate key is an artificial PK introduced by the designer with the purpose of simplifying the assignment of primary keys to tables. Use a Surrogate when you do not want or need the key to have business meaning.
What is the difference between a key and a legend?
There is no difference.
What is an artificial key?
An artificial key is a surrogate key, often an auto-incremented numeric value, used to uniquely identify records in a database when a natural key is not available or appropriate. Artificial keys are generated and managed by the database system, providing a simple and efficient way to uniquely identify records.
How much types of keys are available in dbms?
There are five types of keys in database management system . The name of the five keys are as follows .:1) surrogate key -which is the system generated primary key .2) Primary key - same function as surrogate key but user defined.3) candidate key -combination of two more keys.4) alternate keys - alternative for candidate keys.5) foreign key - primary key of another table.There are five types of keys in database management system.These five keys are surrogate, primary, candidate, alternate, foreign keys .
What was a key difference between the ideas of Hobbes and Locke?
A key difference between Hobbes and Locke is their views on the nature of human beings. Hobbes believed that humans are inherently selfish and need a strong government to maintain order, while Locke believed that humans are inherently rational and have natural rights that should be protected by a limited government.
What is the key difference between a liquid a gas?
intermolecular attractions
What is the key difference between a gas and liquid?
intermolecular attractions
What is the key difference between a liquid and a gas answer?
A is expanded in a container.
What is a key difference between a liquid and a gas?
intermolecular attractions
What is the difference between a key deer and a deer?
key deer are smaller than regular deer
Types of keys?
There are many keys in database each having particular use. Types of keys in database are : Primary key, candidate key, alternate key, foreign key, surrogate key.
Types of keys in database management system?
super key foreign key candidate key surrogate key unique key alternate key composite key compound key
