How to set up a default value when setting (request) a value?

When I ask the user in a SQL statement, then I can declare a default value as in:

SELECT *.
Of all_users
WHERE username = nvl ('& $myvariable ',' SYSTEM');

But when I set a variable that it does not work:

set the tablename = nvl ('& tablename test123 ',' ')

How can I configure a default here?

Peter

Is there a way to set a default value DIRECTLY in SQLplus DEFINE command (and not later, when the value is used in the SQL statement)?

No, there is not to DEFINE them, but you can use ACCEPT:

SQL> accept tablename prompt 'Enter value for table Name:' default EMP
Enter value for table Name:
SQL> select column_name
  2  from cols
  3  where table_name='&tablename';

OrderNumber=1234
COLUMN_NAME
------------------------------
EMPNO
ENAME
JOB
MGR
HIREDATE
SAL
COMM
DEPTNO

8 rows selected.

Max
[My Italian blog Oracle | http://oracleitalia.wordpress.com/2010/02/07/aggiornare-una-tabella-con-listruzione-merge/]

Tags: Database

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