Primary key doesnot allow null value but unique key allows null value.

Difference between primary key and unique key ?

Question Posted / pandiyan

Answer Posted / pandiyan

Primary key doesnot allow null value but unique key allows
null value.

Is This Answer Correct ?

1 Yes

0 No

Please Help Members By Posting Answers For Below Questions

Can we create database in oracle using command line ?

1039

What is a snapshot in oracle database?

976

How to delete a user account in oracle?

922

How to write a left outer join with the where clause in oracle?

1036

How to check the server version in oracle?

1050

What is the purpose of tables, private synonyms and public synonyms in Oracle?

995

How to create a table index?

1077

In oracle there is column command, how will you explain that?

986

How to connect to oracle using service name instead of sid?

970

How to write an inner join with the where clause in oracle?

1016

what are steps for interface? where is exchange rate defined in which table?

2076

What are the varoius components of physical database structure of oracle database?

954

What is the max number of columns in an oracle table?

946

What is oracle server autotrace in oracle?

1099

What is the maximum number of triggers that can be applied to a single table?

965