How to do data level security on users based on region

Hello guys
I currently have created a report with dashboard prompt on column "state" with a default value "CA"
Now, the requirement is to perform data level security on this report, so different users based out of different state will log in to the dashboard and this prompt will change its default value accordingly so the user will have the report on only users home state prompted, and users can't see other state data..
I have thought of creating session variables to achieve the same, but how should i set up the initialization string?
Do I need to create a new table called "user table" that stores username/password and state columns and make that user table join to the fact table in the db?
If so, how should I configure the session value so that users get filtered date based on its state location?
PLease provide guidance
Thanks

Here’s an idea off the top of my head (untested):
First, set up your security constraints normally using Manage…Security in the Administration Tool, so that each user can only see his/her state. Refer to the previous responses to this post for guidelines.
Then, in your dashboard prompt, for the “Default Value”, write a tiny bit of logical SQL to query the “state” column from the presentation layer. If your security constraints are properly in place, the SQL should only return one value.
To get an idea of what the logical SQL should look like, select “All Values” as the default value, then switch it to ‘SQL Results’. That will show you the basic format of the logical SQL. It’s really just normal SQL (select <this> from <that> where <the other>), but referring to presentation layer objects rather than to physical tables and columns.
Untested. Please reply back and let us know how it goes.

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Here are two options to achieve what you want.
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Setting up the context right here, considering a hierarchy of an organization that goes up to 4 levels as below:
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Please mark Correct or helpful if this clears

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Here are two options to achieve what you want.
A. You can do this by coding, that's if you are ready to. Are you? If yes then try the steps below:
1. create a security codes table. Say for example
001 - company a
002 - company b
2. create a security table that will list all users and which company they should have access to. You can also implement this by roles.
3. alter all tables in the application schema to add a security code column. This will be a foreign key reference to table created in 1 above.
4. update all data in the tables according to which company they belong to.
5. write a procedure or package that does a validity check whenever a user requests for data. This procedure/package determines which company data the user has access/rights to.
With this, you should be able to achieve what you want if you do not want to spend on VPD and FGAC. The problem comes where there are users who would have cross access to data from both companies. In this regard, then you have to modify your security table a little bit to handle this.
B. This option i will admit is not so clean. You can also achieve this by two different views for every table in the application schema. And on each of these views, create a private synonym for every user. For illustration purposes:
Table name = Employee.
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create a view employee_b on employee
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create synonym employee on employee_a in x schema.
create synonym employee on employee_b on y schema.
This i have not tried but believe should work.
Hope one of these options serve your purpose.

How to do data level security on users based on region

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