Is a NULL value same as zero or a blank space?If not then what is the difference?

[Hubert]

Hi everyone, I have a question to submit because I can not find the answer elsewhere, is a null value same as zero or a blank space? if not then what is the difference? Thank you kindly inform me please to the question.

[Bartosz]

1.A NULL value represents the absence of a value for a record in a field (others softwares call it also a missing value). 2.An empty value is a "field-formatted" value with no significant data in it. 3.NULL isn't allocated any memory, the string with NUll value is just a pointer