What is difference between UNIQUE constraint and PRIMARY KEY
constraint ?
Answer Posted / kiran
if unique then it can have null
but if column has primary then it cannot have null values
and duplicate values
Is This Answer Correct ? | 2 Yes | 1 No |
Post New Answer View All Answers
What is Reduced List of Values?
What is archive log in Oracle?
hi friends i completed b.com 2004.i have 3y accounting exp. in manufacturing company.now i have completed oracle finance.pls suggest me how will get job in oracle.can i get job in oracle.
What is the recommended interval at which to run statspack snapshots, and why?
Can multiple columns be used in group by in oracle?
What is an oracle cursor variable?
How do I reset a sequence in oracle?
How to set up autotrace for a user account?
what is IDE,DMV in sql server?
What are the logical operations?
how do we code triggers , store procedure , Performance tuning and indexing in a Java Project? Pls kindly get me the perfect answer with the code for each....thank you in advance............pls any body kindly help me soon as possible....
How to define an anonymous procedure without variables?
What are the common oracle dba tasks?
Explain index?
master table and child table performances and comparisons in Oracle ?