ABAP Keyword Documentation → ABAP - Reference → Program Flow Logic → Expressions and Functions for Conditions → log_exp - Logical Expressions → rel_exp - Comparison Expressions → rel_exp - Comparison Rules → rel_exp - Comparing Elementary Data Types → rel_exp - Comparison Type of Calculation Expressions
rel_exp - Comparison Type of String Expressions
String expressions can be used as operands in comparison expressions with
It is possible to compare a string expression with a single operand with any elementary data type or with another string expression.
If one of the operands of a comparison is a string expression, the
comparison type whose
comparison rules are used to perform the comparison is always string. If necessary, single operands are
converted to the type string before the comparison.
Other versions: 7.31 | 7.40 | 7.54
Note
A string expression cannot be specified as the operand of a predicate expression.
Example
This example demonstrates the effect of different comparison types. The first comparison is true, since the character-like operand is converted to the type of the numeric operand (in accordance with the rule for
comparing character-like data types) and the numeric
value is compared. The second comparison is false, since the numeric operand is converted to the type
string of the string expression and the internal representation of the code page used is compared.
WRITE / 'yes'.
ELSE.
WRITE / 'no'.
ENDIF.
IF |02| > 1.
WRITE / 'yes'.
ELSE.
WRITE / 'no'.
ENDIF.