what is null value?

Answer Posted / harsha vardhan reddy

1.It is undefined and uncomparable value.

2.It is not equal to 0 and SPACE.

3.It will not occupy any MEMORY.

4.It has to be supported by every RDBMS package to have
unique treatment for all data types.

5.Any arithematic operations with null returns a null value.

6.It represents with "NULL" keyword and display a space.

Is This Answer Correct ?    10 Yes 1 No



Post New Answer       View All Answers


Please Help Members By Posting Answers For Below Questions

What is Reduced List of Values?

1708


why dont we assign not null constraint as table level constraint.

2257


What are the differences between blob and clob in oracle?

586


What is an external table?

588


What are the advantages of oracle?

555






What are the uses of a database trigger?

521


what is reindexing?

1179


How to unlock the sample user account in oracle?

558


Explain enable novalidate constraint.

599


Can multiple columns be used in group by in oracle?

553


Explain what are the characteristics of data files?

631


Is oracle a language?

528


Can we protect our pl/sql source code?

580


What is the use of oracle?

560


What is raw datatype in oracle?

583