IsNull
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