Appian Community and Appian Academy are being upgraded. As a part of the upgrade, Appian Community is currently in read-only mode, and user registration is disabled until August 3. We apologize for any inconvenience this may cause, but a more secure, stable, and performant Community experience is coming soon!
The new Appian Community launches August 3, followed by Appian Academy on August 7. During the migration, Appian Community Edition, Appian Academy, Documentation, Certifications, Instructor-led Customer Training, Partner Sales Training & Accreditation, and Forum (for Appian Partners and Customers only) will remain available.
I know this is a very basic concept and I predominantly understand the purpose of a Primary Key and a Foreign Key. But as I've been learning the concept of a Unique Key came up and I was unable to find a resource that gives me a clear understanding of the purpose of a Unique Key. I would love it if someone co explain the difference while comparing it to Primary and Foreign Keys potentially with some examples if applicable.
Discussion posts and replies are publicly visible
primary key : evry row must have unique value. so we can identify row easily. so nulls cant be accepted and duplicate values also not allowed.
Foreign Key : easily represents the relation b/w tables.
Unique Key: mainly values has unique but null values allowed and duplicate values not allowed. eg: bank ac number or debit card numbers or vehicle number plates etc..