IsNull - ObjectVision/GeoDMS GitHub Wiki

Predicates functions IsNull

syntax

  • IsNull(a)

definition

IsNull(a) results in a boolean data item with values True for null and False for non null values of data item a.

applies to

  • data item with Numeric, Point or string value type

example

attribute<bool> IsNullA (ADomain) := IsNull(A);
A(float32) IsNullA
0 False
null True
1000000 False
-2.5 False
99.9 False

ADomain, nr of rows = 5

see also

GeoDMS ©Object Vision BV. Source code distributed under GNU GPL-3. Documentation distributed under CC BY-SA 4.0.

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