null value
GIS
The absence of a value. If a particular column of a row in a table is null, that means there is no value stored. Null is not the same as blank or zero.
- — GIS Glossary retrieved 2014-05-27
The absence of a value. If a particular column of a row in a table is null, that means there is no value stored. Null is not the same as blank or zero.