SQL> SQL> SELECT 2 TRIM('A' FROM 'ABCA') both, 3 TRIM(LEADING 'A' FROM 'ABCA') lead, 4 TRIM(TRAILING 'A' FROM 'ABCA') trail, 5 TRIM(' ABC ') blank 6 FROM dual; BO LEA TRA BLA -- --- --- --- BC BCA ABC ABC SQL>