ABAP Keyword Documentation → ABAP − Reference → Program Flow Logic → Expressions and Functions for Conditions → log_exp - Logical Expressions
rel_exp - Comparison Expressions
Other versions: 7.31 | 7.40 | 7.54
Syntax
... { operand1 {=|EQ|<>|NE|>|GT|<|LT|>=|GE|<=|LE}
| {CO|CN|CA|NA|CS|NS|CP|NP}
| {BYTE-CO|BYTE-CN|BYTE-CA|BYTE-NA|BYTE-CS|BYTE-NS}
| {O|Z|M} operand2 }
| { operand [NOT] BETWEEN operand1 AND operand2 }
| { operand [NOT] IN range_tab } ...
Effect
Comparison expressions join two or more operands using a relational operator to make a relational expression and produce a truth value as the result of the comparison.
- The operands are compared using one of the relational operators shown here.
- The comparisons follow comparison rules.
operand1, operand2, and operand are
general expression positions, which means that the following can be specified:
When a built-in function, a functional method, or a constructor expression is specified, its return value or result is used as an operand. When a calculation expression is specified, its result is used. A single operand can be compared with all single operands listed in the comparison rules for single operands. A calculation expression can be compared with all single operands or comparisons listed in the comparison rules for calculation expressions.
Example
Typical use of a logical expression, in this case a comparison of a built-in function with a literal, in a IF statement.
DATA flag TYPE c LENGTH 1.
...
IF to_upper( flag ) = 'X'.
...
ENDIF.