Nullis an absence of a value. An empty string is a value, but is just empty.
Nullis special to a database.
Nullhas no bounds, it can be used for
date, etc. fields in a database.
NULLisn’t allocated any memory, the
NUllvalue is just a pointer which is pointing to nowhere in memory. however, Empty IS allocated to a memory location, although the value stored in the memory is