Oracle:

CREATE CONTEXT

CREATE [ OR REPLACE ] CONTEXT namespace
USING [ schema. ] package
[ INITIALIZED { EXTERNALLY | GLOBALLY }
| ACCESSED GLOBALLY
] ;

Example

CREATE CONTEXT hr_context USING emp_mgmt;

CREATE VIEW hr_org_secure_view AS
SELECT * FROM employees
WHERE department_id = SYS_CONTEXT('hr_context', 'department_id');

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