How should we treat the data if they have no values in it. I mean, at some places, they have no value. Should we populate it as it or should we write something at that place?
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How should we treat the data if they have no values in it. I mean, at some places, they have no value. Should we populate it as it or should we write something at that place?
The concept of the
NULLvalue is a common source of confusion for newcomers to SQL, who often think thatNULLis the same as an empty string ”, or a value of zero.This is not the case. Conceptually,
NULLmeans “a missing unknown value” and it is treated somewhat differently from other values. For example, to test forNULL, you cannot use the arithmetic comparison operators such as=,<, or<>.If you have columns that may contain “a missing unknown value”, you have to set them to accept
NULLs, and use aNULLvalue as @codaddict suggested in the other answer.