Compares the operand operand1 on the left side with the operand operand2 on the right side. The same applies to relational operators as in a
condition for statements. The operands of size comparisons can have the following data types here:
Numeric data types: All except decimal floating point numbers
Character-like data types: CHAR, CLNT, LANG, CUKY, UNIT or c, NUMC or n, DATS or d, TIMS or t.
The operand operand2 on the right side can be any
SQL expression, which covers columns, literals, host variables, and host expressions. If an operand of the comparison has the
null value, the result of this comparison is unknown.
operand [NOT] BETWEEN operand1 AND operand2
Checks the assignment to an interval. The relational expression functions in the same way as the corresponding
condition for statements. The addition NOT is not possible. The operands can have the same data types as for size comparisons. Any
SQL expressions can be specified for operand1
and operand2, which covers columns, literals, host variables, and host expressions. If one of the operands has the
null value, the result of the check is unknown.
operand1 [NOT] LIKE operand2 [ESCAPE esc]
Pattern comparison. The relational expression functions in the same way as the corresponding
condition for statements. The addition NOT is not possible. The same applies to the operands as in the
condition for statements. The operands must be character-like and only literals and
host variables prefixed with an escape character @ can be specified on the right side.
The operands on the left side can be any SQL expressions, which covers columns, literals, host variables,
and host expressions. With the exception of LIKE, all occurring columns and
expressions can have any dictionary types (except for ACCP, DF16_SCL (obsolete), DF34_SCL (obsolete),
LCHR, LRAW, PREC, RAWSTRING, and STRING). Literals, host variables, and host expressions can have any ABAP types, except for string and xstring.
It must be possible to compare the data
types of the operands of a relational expression. If this is not the case, a statically specified type raises a syntax error and a dynamically specified type raises an exception of the class CX_SY_DYNAMIC_OSQL_SEMANTICS. Unlike in
conditions for statements, operands of the types DATS and TIMS are handled like regular flat character-like operands.
If an expression is used for a selection, the
client column of a client-specific data source of a query or of the target of a write statement can only be used as an operand in an SQL condition of the expression if automatic
client handling is deactivated for the query or write by the addition CLIENT SPECIFIED. This is not possible for
Because an expression is passed to the database essentially unchanged, the possible relational expressions and their operands represent only a subset of the
relational expressions for statements. In some constructs,
however, a WHERE, HAVING, or ON
condition of a statement is processed by the ABAP runtime environment before the pass, to ensure platform-independent behavior.
The addition NOT cannot currently be specified in front of BETWEEN
and LIKE. Instead, the operator NOT can be used in front of the full expression.