Question

I thought that the schemas are namespace instances and hence the same table created under 2 different schemas are 2 different objects from the perspective of the database. One of my colleagues claim that schemas are nothing but a security container, hence we can create the same table in different schemas. Is this true?

Answer 1

You are correct.

CREATE TABLE foo.T
(
c int
)

and

CREATE TABLE bar.T
(
c int
)

creates 2 separate objects. You could create a synonym bar.T that aliases foo.T though.

CREATE SCHEMA foo
GO
CREATE SCHEMA bar
GO
CREATE TABLE foo.T(c INT)
GO
CREATE SYNONYM bar.T FOR foo.T;
INSERT INTO foo.T VALUES (1);
SELECT * FROM bar.T;