Is an empty field NULL?

Does empty mean null?

The difference between null and empty is that the null is used to refer to nothing while empty is used to refer a unique string with zero length.

Is Empty and null are same?

The Java programming language distinguishes between null and empty strings. An empty string is a string instance of zero length, whereas a null string has no value at all. An empty string is represented as "" . It is a character sequence of zero characters.

Is null 0 or blank?

In database terms, however, a null value is a value that doesn't exist: the field does not contain a value of any kind (not even a blank value). By contrast, a blank value is a real value: it just happens to be a string value containing 0 characters.

Is blank space null?

As both blank space and NULL are treated differently, fields with blank space cannot be retrieved using IS NULL condition.