期间状态

SELECT period_name,
               decode(closing_status,
                      'O',
                      'Open',
                      'C',
                      'Closed',
                      'F',
                      'Future',
                      'N',
                      'Never',
                      closing_status) po_status
          FROM gl_period_statuses
         WHERE application_id = 201 --Purchasing  
           AND start_date >= to_date('01-03-12', 'dd-mm-yyyy')
           AND end_date < to_date('01-03-12', 'dd-mm-yyyy')
           AND set_of_books_id = &set_of_books_id