difference between NULL Values & Missing values - Programmers Heaven

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difference between NULL Values & Missing values

JlakshmiJlakshmi Posts: 1Member
Hi ALL,

Can anyone let me know the Difference between NULL values & missing values

If i write a query like For Ex:

1) select * from EMP where EMP_SALARY is not NULL
2) select * from EMP where EMP_SALARY is not missing

can anyone of you please help me in this regard

Thanx in Advance

Lakshmi

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