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Pseudo Column 
The
SQL syntax elements for Oracle Version 7 and SAP DB Version 7.4 in SQL mode ORACLE differ, among other things, in the definition of pseudo columns.
- The pseudo column LEVEL is not supported in SAP DB.
- Pseudo column ROWID can only be used if the option ROWID was specified in the
CREATE TABLE statement. In contrast to Oracle, SAP DB produces a logical column identification of the data type RAW(8).
In SAP DB, pseudo column ROWNUM cannot be used in the UPDATE statement.
The pseudo column ROWNUM is entered into a selected column (select_column) after the result table has been sorted.
