ABAP Keyword Documentation → ABAP − Reference → Program Flow Logic → Expressions and Functions for Conditions → log_exp - Logical Expressions → rel_exp - Comparison Expressions → rel_exp - Relational Operators

rel_exp - Relational Operators for Byte-Like Data Types

The following table shows the relational operators for comparisons between byte-like operands (single data objects or return values or bit expressions) in comparison expressions.

operator	Meaning
`BYTE-CO`	Contains Only: True, if `operand1` only contains bytes from `operand2`.If `operand2` is of type `xstring` and initial, therelational expression is false, except if `operand1` is also of type `xstring` and initial. In this case, the relational expression is always true. If the comparisonis false, `sy-fdpos` contains the offset of the first byte in `operand1`,which is not contained in `operand2`. If the comparison is true, `sy-fdpos` contains the length of `operand1`.
`BYTE-CN`	Contains Not Only: True, if a relational expression with `BYTE-CO` is false,if therefore `operand1` does not only contain bytes from `operand2`.If the comparison is true, `sy-fdpos` contains the offset of the first characterin `operand1` that is not contained in `operand2`.If the comparison is false, `sy-fdpos` contains the length of `operand1`.
`BYTE-CA`	Contains Any: True, if `operand1` contains at least one byte from `operand2`. If `operand1` or `operand2` are ofthe type `xstring` and initial, the relational expression is always false.If the comparison is true, `sy-fdpos` contains the offset of the first bytein `operand1` that is also contained in `operand2`.If the comparison is false, `sy-fdpos` contains the length of `operand1`.
`BYTE-NA`	Contains Not Any: True, if a relational expression with `BYTE-CA` is false,if therefore `operand1` does not contain a byte from `operand2`.If the comparison is false, `sy-fdpos` contains the offset of the first bytein `operand1` that is also contained in `operand2`.If the comparison is true, `sy-fdpos` contains the length of `operand1`.
`BYTE-CS`	Contains String: True, if the content of `operand2` is contained in `operand1`. If `operand1` is of type `xs` andinitial, the relational expression is false, except if `operand2` is also oftype `xstring` and initial. In this case, the relational expression is alwaystrue. If the comparison is true, `sy-fdpos` contains the offset of `operand2`in `operand1`. If the comparison is false, `sy-fdpos` contains the length of `operand1`.
`BYTE-NS`	Contains No String: True, if a relational expression with `BYTE-CS` isfalse, if therefore `operand1` does not contain the content of `operand2`.If the comparison is false, `sy-fdpos` contains the offset of `operand2`in `operand1`. If the comparison is true, `sy-fdpos` contains the length of `operand1`.

Other versions: 7.31 | 7.40 | 7.54

Example

The logical expression in the IF statement is true, if the second half-byte is not filled for any of the bytes in hex1.

DATA: hex1 TYPE xstring,
hex2 TYPE xstring.

hex1 = ...
hex2 = '000102030405060708090A0B0C0D0E0F'.

IF hex1 BYTE-CO hex2.
...
ENDIF.