Mysql Property

Question

Hi What MySQL property is used to create a surrogate key in MySQL? Thanks

Prabhu Raja · Answer

Hi A surrogate key is a unique DBMS-supplied identifier intended to be used as the primary key of a table. Further the DBMS will not allow the value of a surrogate key to be changed. The values of a surrogate key have no meaning to the users and are usually hidden on forms and reports. AUTO_INCREMENT property is used to create surrogate in all DBMS.

Arjun Panwar · Answer

Thanks to all

Satyapriya Nayak · Answer

Hi Arjun A surrogate key 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.A surrogate key is frequently a sequential number (e.g. a Sybase or SQL Server identity column a PostgreSQL serial  an Oracle SEQUENCE or a column defined with AUTO_INCREMENT in MySQL ) but doesn't have to be. Having the key independent of all other columns insulates the database relationships from changes in data values or database design (making the database more agile ) and guarantees uniqueness. Please refer the below link http://blog.mclaughlinsoftware.com/2009/05/16/surrogate-keys-uses/ Thanks