ABAP Keyword Documentation → ABAP - Reference → Program Flow → Expressions and Functions for Logical Expressions → log_exp - Logical Expressions → log_exp - Comparisons → log_exp - Relational Operators

log_exp - relational operators for byte-type data types

The following table shows the relational operators for comparisons between byte-like operands (single operands or bit expressions).

operator	meaning
`BYTE-CO`	Contains Only: True, if `operand1` only contains bytes out of `operand2`.If `operand2` is of type `xstring` and initial, thenthe logical expression is false, except if `operand1` is also of type `xstring` and initial. Then the logical expression is always true. If the comparison is false,then `sy-fdpos` contains the offset of the first byte in `operand1`,which is not contained in `operand2`. If the comparison is true, then `sy-fdpos` contains the length of `operand1`.
`BYTE-CN`	Contains Not Only: True, if a logical expession with `BYTE-CO` is false,if `operand1` does not only contains bytes out of `operand2`.If the comparison is true, then `sy-fdpos` contains the Offset of the firstcharacter in `operand1`, which is not contained in `operand2`.If the comparison is false, then `sy-fdpos` contains the length of `operand1`.
`BYTE-CA`	Contains Any: True, if `operand1` contains at least one byte out of `operand2`. If `operand1` or `operand2` are ofthe type `xstring` and initial, only the logical expression is always false.If the comparison is true, then `sy-fdpos` contains the offset of the firstcharacter in `operand1` which is also contained in `operand2`.If the comparison is false, then `sy-fdpos` contains the length of `operand1`.
`BYTE-NA`	Contains Not Any: True, if a logical expression with `BYTE-CA` is false,if `operand1` does not contain a byte out of `operand2`.If the comparison is false, then `sy-fdpos` contains the offset of the firstcharacter in `operand1` which is contained in `operand2`.If the comparison is true, then `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 `xstring`and initial, then the logical expression is false, unless `operand2` is alsoof type `xstring` and initial. Then, the logical expression is always true.If the comparison is true, then `sy-fdpos` contains the offset of `operand2`in `operand1`. If the comparison is false, then `sy-fdpos` contains the length of `operand1`.
`BYTE-NS`	Contains No String: True, if a logical expression with `BYTE-CS` is false,if `operand1` does not contain the content of `operand2`.If the comparison is false, then `sy-fdpos` contains the offset of `operand2`in `operand1`. If the comparison is true, then `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 at none of the bytes in hex1.

DATA: hex1 TYPE xstring,
hex2 TYPE xstring.

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

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