Refresh constraints

 

Image representing Oracle Corporation as depic...
Image via CrunchBase

Constraints are one of the fundamental concepts, which arrive at a very elementary stage of Database designing. Constraints are nothing but the rules on the data. This preserves the Entity integrity, Referential Integrity, and Domain Integrity of the data. While entity integrity focusses on uniqueness and NULLable property of a data, referential checks the data of a column ‘in reference to’ its parent column. Domain integrity defines a domain set for a column.

 They are imposed upon the table columns, where they act as barrier for the incoming data. Once the checks are activated, only the obedient data is allowed to grab the seat. System raises the ‘Violating’ exception, if the data fails the constraint rule.

My obligations to DBANotes.com, who published the content. Read the complete paper at the below link.

 http://www.dbanotes.com/database-development/understanding-oracle-11g-constraints/

Do post your feedback/comments/queries.

Saurabh

 

Advertisements

Author: Saurabh K. Gupta

Published Author, Data guy

3 thoughts on “Refresh constraints”

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google+ photo

You are commenting using your Google+ account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

w

Connecting to %s