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|Types of Missing Information|
Codes Used to Represent Missing Information in Other Tables
||Value not applicable
||Value is not applicable to rows of the current type.
||Value is unknown by the computer user or source of information.
||(Does Not Exist)
||Value does not exist
||Value is applicable, but it does not exist.
||Value not valid
||Value supplied by source is invalid within computer system.
||Value not supplied
||Value was not supplied by the source of the information--"no comment."
||(Not Yet Classified)
||Value not yet classified
||Computer user has not yet chosen or entered the proper value.
||(Inherit Default Value)
||Value is inherited
||Default value is inherited from an above entity.
||(Do Not Care)
||Do not care
||User does not care about the value.
||Value represents all non-missing values within target table.
||(All Other Values)
||All other instances
||Value represents all non-missing and non-specified values within target.
||(Unknown Why Missing)
||Unknown why missing
||Set when data loaded from other computer sources contains blanks.
||Result of some operation is undefined.
||Value is the empty set
||Result of some join operation returned nothing.
||(Outer Union Result)
||Outer union type
||Result of an outer union operation.