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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.
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