viewquestions/12431/What is meant by recursive relationship Database Management Systems 10CS54 VTU notes 8 Marks Jun July 2013June 2016

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Explain Foreign key and its importance.?: Database Management Systems - 10CS54 VTU notes 8 Marks (Jun / July 2013)(10 Marks Jan 2016)

 Can foreign key exist, only for single table explain? 


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A foreign key is a field (or fields) that points to the primary key of another table. The purpose of the foreign key is to ensure referential integrity of the data. In other words, only values that are supposed to appear in the database are permitted. 
 CREATE TABLE ORDERS (Order_ID integer, Order_Date date, Customer_SID integer, Amount double, Primary Key (Order_ID), Foreign Key (Customer_SID) references CUSTOMER (SID)); 

Nikhil-bharadwaj

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