If executed a long SQL statement, found a mistake in the statement, and you don't want enter that long statement again, you can use the input buffer commands to the correct last statement and re-run it. The following tutorial exercise gives you a good example:

SQL> connect HR/retneclgg

SQL> SELECT FIRST_NAME, LAST_NAME, HIRE_DATE

2 FROM EMPLOYEE WHERE FIRST_NAME LIKE 'Joh%';

FROM EMPLOYEE WHERE FIRST_NAME LIKE 'Joh%'

*

ERROR at line 2:

ORA-00942: table or view does not exist

SQL> LIST

1 SELECT FIRST_NAME, LAST_NAME, HIRE_DATE

2* FROM EMPLOYEES WHERE FIRST_NAME LIKE 'Joh%'

SQL> CHANGE /EMPLOYEE/EMPLOYEES/

2* FROM EMPLOYEES WHERE FIRST_NAME LIKE 'Joh%'

SQL> RUN

(Query output)

SQL> INPUT ORDER BY FIRE_DATE

SQL> LIST

1 SELECT FIRST_NAME, LAST_NAME, HIRE_DATE

2 FROM EMPLOYEE WHERE FIRST_NAME LIKE 'Joh%'

3* ORDER BY HIRE_DATE

SQL> RUN

(Query output)

SQL> CLEAR BUFFER

buffer cleared

SQL> LIST

SP2-0223: No lines in SQL buffer.