What is a null?
The word null or DG is a much managed term in the science of computing, which refers to anything that is an undefined value.
In the area of programming, is the result of a diligent special value to a pointer used to show that the pointer does not fit to a valid data. The value 0 is commonly used “zero” to define null, this is because most operating systems assume the try to adhere to a memory address low as if it were a mistake.
Similarly, results for logical operations are required:
Operation “Or” or “OR”
True or null = true
False or null = 0
Operation “And” or “AND”
True and null = 0
False and null = false
Is also used in other areas and is not a unique term of programming.
In scope of the databases the term null is used to show the absence of a value Assembly to a field for a particular record in the tables.
What programming languages use this term?
Almost all it is a term which as already mentioned indicated the absence of a value.
Would that other disciplines to use this term?
In all those requiring store information or analysis, for example medicine, crimino-ology, statistics, etc.
What is null in SQL?
It is a special term used in structured query language (SQL) to show that a value or data in a database there is. This was done by the author of the relational model of databases.