what is the difference between unique and primary key
- 5 Answers
- 4413 Views
- I also Faced
- E-Mail Answers
Answer Posted / vinod
uniqe key allow one null value only but primary key cannot
allow any null value
| Is This Answer Correct ? | 0 Yes | 1 No |
Post New Answer View All Answers
What are the disadvantages of a query?
Define dml compiler.
What is rdbms architecture?
What is the purpose of a database?
Explain what are tp-lite and tp-heavy monitors?
What do you mean by deadlock dbms?
Which free database is best?
Why do we study dbms?
What are the two types of indexes and explain them in detail? Or what's the difference between clustered and non-clustered indexes?
What is the normal procedure followed by a java client to access the db?
1. How many nodes you are using project? 2. What is configuration file? 3. What is modules partition? How it is work in project? 4. What is Environment Variable? How it is use? 5. What is sequence? 6. How do you execute parallel jobs in projects? 7. If you run a job in job sequencer individually without any comments? 8. How many jobs did in your project? 9. How to schedule the job in Data stage 7.5 X2? 10. If you have 10 jobs in PX2, shall you run all jobs at a time? 11. I have 5 jobs (1-5), I connect with each other, but I want to run from 3-5 only how? 12. What is same partition? 13. If you have 40GB hard disk in I have 30GB data how I configure the nodes for partition? 14. Did you write any code for Data stage project? 15. Did you write any code for parallel job execution in your project? 16. Will you schedule all jobs at a time?
What is meant by database management system?
How many number of columns can a RECORD GROUP have ?
Why is data modelling important?
What are the different types of data tables?
