Replace blank column values with ZERO

Question

Hi experts,
I am building a report to display count of orders split by channel per day per hour.
For some days one or few channels might not have any orders placed against them in which case my report shows blank values in the report.
I would ideally like to have Zero in those columns rather than an empty cell.
Sample Qry :-
Select
Channel,
COUNT(order_num) as COUNT
FROM
SALES_ORDER
Pls help !
Thanks in advance.

Answer 1

Try this code
/* Formatted on 2009/05/11 07:53 (Formatter Plus v4.8.8) */
SELECT   a.CLASS, a.order_date, a.time_created,
         NVL (a.count_orders, 0) AS count_orders
    FROM (SELECT   sales_order_header.soh_class AS CLASS,
                   TO_CHAR
                          (sales_order_header.soh_date_created,
                           'dd/mm/yyyy'
                          ) AS order_date,
                   SUBSTR
                      (TO_CHAR (sales_order_header.soh_time_created,
                                'HH24:MI:SS'
                       1,
                       2
                      ) AS time_created,
                   COUNT (sales_order_header.soh_order_no) AS count_orders
              FROM com.sales_order_header
             WHERE sales_order_header.soh_date_created >=
                                         TRUNC (NEXT_DAY (SYSDATE, 'SUN'))
                                         - 14
               AND sales_order_header.soh_date_created <
                                          TRUNC (NEXT_DAY (SYSDATE, 'SUN'))
                                          - 6
          GROUP BY sales_order_header.soh_class,
                   TO_CHAR (sales_order_header.soh_date_created, 'dd/mm/yyyy'),
                   SUBSTR (TO_CHAR (sales_order_header.soh_time_created,
                                    'HH24:MI:SS'
                           1,
                           2
          UNION ALL
          SELECT   sales_order_header.soh_own_id AS CLASS,
                   TO_CHAR
                          (sales_order_header.soh_date_created,
                           'dd/mm/yyyy'
                          ) AS order_date,
                   SUBSTR
                      (TO_CHAR (sales_order_header.soh_time_created,
                                'HH24:MI:SS'
                       1,
                       2
                      ) AS time_created,
                   NVL
                      (COUNT (sales_order_header.soh_order_no),
                       0
                      ) AS count_orders
              FROM com.sales_order_header
             WHERE sales_order_header.soh_date_created >=
                                         TRUNC (NEXT_DAY (SYSDATE, 'SUN'))
                                         - 14
               AND sales_order_header.soh_date_created <
                                          TRUNC (NEXT_DAY (SYSDATE, 'SUN'))
                                          - 6
          GROUP BY sales_order_header.soh_own_id,
                   TO_CHAR (sales_order_header.soh_date_created, 'dd/mm/yyyy'),
                   SUBSTR (TO_CHAR (sales_order_header.soh_time_created,
                                    'HH24:MI:SS'
                           1,
                           2
                          )) a
ORDER BY a.order_date DESC, a.CLASS ASC