SQL: 1999 permit recursive view definition.
Example: Find all employeemanager pairs, where the employee reports to the manager directly or indirectly.
WITH RECURSIVE empl(employee_name, manager_name) AS (
SELECT employee_name, manager_name
SELECT manager.employee_name, empl.manager_name
FROM manager, empl
WHERE manager.manager_name = empl.employee_name)
This example view, empl, is called the transitive closure of the manager relation.
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