ABAP Keyword Documentation → ABAP - Dictionary → ABAP CDS in ABAP Dictionary → ABAP CDS - Data Definitions → ABAP CDS - DDL for Data Definitions → ABAP CDS - DEFINE VIEW → ABAP CDS - SELECT → ABAP CDS - SELECT, Operands and Expressions → ABAP CDS - cond_expr
ABAP CDS - cond_expr, NULL
.... lhs IS [NOT] NULL ...
Identifies the null value in a CDS view. The relational expression is true if the value of lhs is (not) the null value. The same context-dependent rules apply to the operands lhs as to comparisons and only operands of the comparable types can be specified.