Null
is an absence of a value. An empty string is a value, but is just empty.Null
is special to a database.Null
has no bounds, it can be used forstring
,integer
,date
, etc. fields in a database.NULL
isn’t allocated any memory, thestring
withNUll
value 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""
.
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