Accesing the tables of one schema in another schema

Hi
I have doubt .. suppose i have a user called DEMO and it has tables . now i have a another user called DEMO1
my doubt is . how can i get the tables of DEMO user into DEMO1. If update the table in DEMO1 that should reflect
in DEMO user. help me.........

Before going further, you should clarify your requirements and make sure you have a good understanding of:
- Synonyms
- Views
- Replication such as materialized views
- Basic security including object grants
Assuming this is all in the same database...
If you just need to have one user access data in another schema, you need grants.
If you need to make it 'look like' the data in that other schema is in your schema, you should be looking at synonyms or views.
If you need to capture the data periodically from the other schema, you should be looking at materialized views.
If you are straddling multiple databases then the choices may be less clear-cut but you should still be looking at these capabilities to assemble a solution
From what you have said so far, triggers should not even be on your radar.

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