what is the different between unique+not null & primary key,
- 4 Answers
- 7038 Views
- I also Faced
- E-Mail Answers
Answer Posted / mohan babu
A unique key is nothing but it does not allow any
duplicateds but allows nullvalues
A primary key is nothing but it does not allow duplicates
as well as Null values i.e Not Nulls
| Is This Answer Correct ? | 5 Yes | 5 No |
Post New Answer View All Answers
What is the trigger in sql?
What is audit logout in sql profiler?
How do I run a program in pl sql?
What is scalar function?
What does over partition by mean in sql?
What are the most important characteristics of pl/sql?
Why use subqueries instead of joins?
How do I make my sql query run faster?
How do I sort a table in sql?
What is break?
Can %notfound return null after a fetch?
What is a constraint? Tell me about its various levels.
Write a sql query to get the third highest salary of an employee from employee_table?
How do I save the results of sql query in a file?
Why schema is used in sql?
