Error: ORA-01918

Question

Hi,
I have a table: Role.This role table has rolenumber, rolename and rolerank.
Rolenumber Rolename Rolerank
1 Admin 1
2 Datamanager 2
3 Consultant 3
4 Fulltime 4
I have another table: user.
This table has main field userid followed by other user information.
I have another table: userrole.
This table has fields: userid, createdby,createddate,rolenumber
The requirement is :
Admin : delete and convert existing users to Datamanager.
Consultant : delete and convert existing users to Data Entry.
Full Time : delete and convert existing users to Full Access.
As the Data Entry and Full Access roles are not available in the role table, i created two new role names through insert statements.Now the role table looks as follows:
Rolenumber Rolename Rolerank
1 Admin 1
2 Datamanager 2
3 Consultant 3
4 Fulltime 4
5 Data Entry 5
6 Full Access 6
Then with the update statements, I updated all existing consultant users to Data Entry and all existing Full Time users to Full Access.
If I want to create a new userid, I need to login as datamanager and create a new userid.So I created a new userid for example as Naina with the role as Data Entry.
Now the userrole table looks as follows:
userid createdby createddate rolenumber
Naina datamanager 11/07/07 5
This userid appears in the "List of existing users" screen in the datamanager account.We have two modes: add mode and edit mode.
while creating this userid in the "Create User Screen" during add mode, we have one field Password.I entered " aaaaaa" in that field. In the edit mode of that userid, we have one field change password. This change passowrd allows the user to create a new password for that userid. When I changed the password for Naina and click save button at the bottom of the screen during edit mode, it displayed
the error message : ORA-01918: user 'NAINA' does not exist.
I executed select statement on both tables:user and userrole. i could get the output of those two select statements because this userid information is being stored in the database.
Could any one tell how I can resolve this error: "ORA-01918".
Thanks,
Prathima

Answer 1

No one can possibly help you nor do I think they should.
First you are a student as is obvious from the exercise.
Second you seem to be using a front-end tool of which we have no knowledge.
Third you posted no DDL or DML
Fourth you posted no version
We have absolutely no idea what does or does not happen when you push some button.
I would suggest you discuss this with your teacher.