例: 再帰的問合わせでのSQL UDFの呼び出し - Teradata Database - Teradata Vantage NewSQL Engine - 例: 再帰的問合わせでのSQL UDFの呼び出し、WITH修飾子

この例では、再帰的問合わせのWHERE句で、SQL UDFのvalue_expressionを呼び出します。

     WITH RECURSIVE temp_table (employee_number) AS (
       SELECT root.employee_number
       FROM employee AS root
       WHERE root.manager_employee_number = 801
       AND   test.value_expression(dept_no, 0) = 25;
     UNION ALL
       SELECT indirect.employee_number
       FROM temp_table AS direct, employee AS indirect
       WHERE direct.employee_number = indirect.manager_employee_number
       AND   test.value_expression(2,3) = 5
       )
     SELECT *
     FROM temp_table
     ORDER BY employee_number;