Hi ilikeoracle,
hope this helps...
undefine dno;
Regards.
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Question
sql - plus
Can Anyone Help Me In Clearing The Values Within Substitute Variable For A Session :
Ex :
Select * From Emp Where Deptno = '&&Dno';
This Will Prompt To Enter The Value For Deptno. Lets Assume User Enters Value 20.
The Above Command Will Give Employee Details Belonging To Dept 20.
Now, Again When The Same Query Is Executed, It Should Prompt To Renter The Value For Deptno. But Its Not.
If We Terminate The Session & Re-Execute The Above Command It Prompts For The Value.
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by: adixitPosted on 2004-05-30 at 23:38:44ID: 11194581
accept Dno prompt " Please enter the department ID: "
Select * From Emp Where Deptno = '&&Dno';
--------------------------
1. & means it will prompt you for the value and use it oinly once .
eg insert into .... values ( .... , '&name',&rno);
if you execute it ,it will prompt you for values of name and rno . ( name is char /vrachar type notice the '' and rno is numeric.
when you execute it next tim,e over it will AGAIN prompt you for the values .
2. && means it will prompt you for the value once and keep the values for the varibables till you explicitly unset them or use a different session eg if you replace & with && in the above example it will prompt for the values of name and rno first time over , and will use the same values for the supsequent executions till you explicitly unset the variable or log out and log in again.