Oracle Database Interview Question:

How To Revise and Re-Run the Last SQL Command?

Submitted by: Administrator

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.
Submitted by: Administrator