Ne_or_one_null - ObjectVision/GeoDMS GitHub Wiki

Ordering functions not equals or one side has null values

• ne_or_one_null(a, b)

ne_or_one_null(a, b) results in a boolean data item indicating if the values of data item a are not equal to the corresponding values of data item b or if the corresponding values of data items a or b are null.

The comparison between two missing values (null = null) results in the value False.

Data items with Numeric, Point, or string value type

1. Domain of the arguments must match or be void (literals or parameters can be compared to data items of any domain).
2. Arguments must have matching:
   • value type
   • metric

1. attribute<bool> neAB (CDomain) := ne_or_one_null(A, B);

• not equals