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Creating foreign key at table creation.

Posted By:Abhisek Panda       Posted Date: November 30, 2009    Points: 10    Category: SQL Query    URL: http://www.dotnetspark.com  

The following syntax will add a foreign key to the database table at the time of table creation,

CREATE TABLE(col datatype FOREIGN KEY REFERENCES(PK_colname),col datatype,....)

pk_table is the name of the table which will be accessed by the foreign key and that contains the primary key. PK_colname is the name of the column on which primary key is defined in the primary table.

The datatype of both the columns should match , i.e, primary key column and foreign key column.

A table can contain more than one foreign key.

The value of the foreign key be either null or any value from the refereed primary key domain.


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