How to work with two schema

Hi All,
Now i am working In Like Schema Name ABC ,it's an live working schema.Now i want to create an Schema for test Application.if i insert data for test it should not reflect Schema ABC untill Value should insert into rtest Schema.How can i do this,.
i want firstly i test my aplication with test data then my user run with his schema.
How can i do this.
Thanks

This is a bad idea on so many levels - for one, if you are working from the same applications, any changes you make are potentially going to affect your user(s), which is not going to do your robustness or user acceptance any favours.
Ideally, you would have at least two separate database instances - development and production, which would be set up the same. I appreciate that resources may not stretch to that.
At worst, you should copy your application into another development schema on the same instance and make your changes in that - thereafter you can propagate changes to the application by copying over the old live instance with your state-of-the-art 'dev' version. NEVER NEVER NEVER make changes directly into the live version - you're only storing up more pain in the future.

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