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SQL FOREIGN KEY Constraint 21 Jan 2013 | 12:30 am
The FOREIGN KEY constraint is used to point to primary key of another database table. Foreigh key ensures that the data exists when we have reference to it. For example, we have a table of Employee (E...
SQL UNIQUE Constraint 15 Dec 2012 | 09:23 pm
The UNIQUE constraint is used to uniquely identify each row in a database table. It is some similar to Primary key, but has some difference: Primary Key is automatically Unique Constraint One table sh...
