premika

• Jul 8th, 2005

 

primary,not null,unique 

Kiranmayi

• Jul 16th, 2005

 

Oracle uses integrity constraints to prevent invalid data entry into the database. It can be achieved using NOTNULL, Primary Key ,CHECK, Foreign Key etc..... constraints

KananTrivedi

 Profile Answers by KananTrivedi 

• Sep 9th, 2009

 

Data integrity constraint is a declarative method of defining a rule for a column of a table. ex. Not Null, Unique Key , PRIMARY KEY, FOREIGN KEY, CHECK.