Answer Posted / pr@$@d
Null means unknown value
The value null can be regarded as an unknown value.
Therefore, the following select statement returns null:
select 5+7+null+9 from dual;
Note : A null can be assigned but it can not be equated
with anything: Even itself.
Regards,
-Pr@$@d.
prasadreddi@ymail.com
| Is This Answer Correct ? | 18 Yes | 3 No |
Post New Answer View All Answers
What is a cursor variable?
How to experiment a data lock in oracle?
How to find out what oracle odbc drivers are installed?
What is the difference between $oracle_base and $oracle_home?
What is an oracle wallet?
How to insert a new row into a table in oracle?
Explain the use of grant option in imp command.
What do you mean by group by clause?
What is the difference between primary key and unique key and foreign key in oracle?
Explain about your project and its relation to the current job position you are applying to?
What is a system tablespace?
What is the order of defining local variables and sub procedures/functions?
What is a data dictionary and how can it be created?
Explain alias?
What is hot backup and logical backup?