Difference between primary key and unique key ?
- 77 Answers
- 198331 Views
- Accenture, B2B Software Technologies, Cognizant, HP Finsoft, IndiaNIC, Karomi Technology, Keane India Ltd, L&T, Onward eServices, R Systems, Shakti, Techtic Solutions, I also Faced
- E-Mail Answers
Answer Posted / rakesh dwivedi
1.Primary key can not have null.Instead of it unique can have null at lest single time null.
2 In a table only one primary key exist.Unique can be multiple in table.
| Is This Answer Correct ? | 0 Yes | 0 No |
Post New Answer View All Answers
How to retrieve values from data fields in record variables?
Explain how are indexes update?
What are group functions in oracle?
Explain the use of owner option in exp command.
How to write date and time interval literals in oracle?
1) Does oracle have any table which contain all the exceptions and it's code internally?
How to use "for" statements in oracle?
Why we use bulk collect in oracle?
what is the use of system.effective.date variable in oracle?
What is the relation of a user account and a schema?
What is dynamic proxy?
What is oracle sid?
Explain the features of oracle?
What is oracle instant client?
How do I connect to oracle database?
