Interested to Buy Any Domain ? << Click Here >> for more details...
"primary key=unique+null" is equal,reson?not,reason?
- 5 Answers
- 7109 Views
- I also Faced
- E-Mail Answers
Answer Posted / karunakar reddy s
primary key = unique and not null in a table
because primary key act as foreign key in other table, and
we can identify the records using this key. If pk has null
value how can we identify the records in the first table
| Is This Answer Correct ? | 8 Yes | 0 No |
Post New Answer View All Answers
How a tablespace is related to data files?
What is an oracle function?
Explain the use of consistent option in exp command.
How to add a new column to an existing table in oracle?
How to create a new oracle data file?
Please send me Informatica 8.1 certification dumps, my mail id mona85gupta@gmail.com
types of indexes and the rationale behind choosing a particular index for a situation.
What is a dynamic performance view in oracle?
How view is different from a table?
What is the sid in oracle?
How to sort output in descending order in oracle?
What is format trigger?
Explain the truncate in oracle?
Does oracle partitioning improve performance?
How to convert numbers to characters in oracle?
