Question

I have been looking over the web but have not come across an answer to my problem. The closest I found was this also from StackOverflow.

So what I have is transactions with different statuses. I am trying to compile a query that will summarize all transactions according to their status. I can easily do that with a Group By, but what I need and can’t do is to sum two of the particular statuses. For example:

Status 
--------
Status_A
Status_B
Status_C_D
Status_C
Status_D
Status_E

Status_C_D above would be the sum of Status_C and Status_D. In case you are wondering, status C is a kind of transaction error, and Status_D is another kind of error, so they want the sum of both to easily see the total of transactions with errors (everything will be shown on a report). What I have is this:

SELECT DECODE(STATUS_CD, 
         0, 'Status_A',
         1, 'Status_B',
         2, 'Status_C',
         3, 'Status_D',
         4, 'Status_E',
         'Unknown') status
FROM table_a ...

Hopefully that’s enough context. Any help is much appreciated. 🙂

select decode(TABLE_A.status_cd, 0,  'Status A',
                                 1, 'Status B',
                                 2, 'Status C',
                                 3, 'Status D',
                                 4, 'Status E',
                                 'Unknown') status, 
        SUM(decode(trunc(((sysdate - TABLE_A.date_time) +8) / 8), 1, 1, 0)) "0-7",
        SUM(decode(trunc(((sysdate - TABLE_A.date_time) +8) / 8), 2, 1, 0)) "8-15",
        SUM(decode(trunc(((sysdate - TABLE_A.date_time) +8) / 8), 3, 1, 0)) "16-23",
        SUM(decode(trunc(((sysdate - TABLE_A.date_time) +9) / 8), 4, 1, 0)) "24-30",
        SUM(decode(trunc(((sysdate - TABLE_A.date_time) -1) / 30), 1, 1, 0)) "31-60",
        SUM(decode(trunc(((sysdate - TABLE_A.date_time) -1) / 30), 2, 1, 0)) "61-90",
        SUM(decode(trunc(((sysdate - TABLE_A.date_time) -1) / 30), 3, 1, 0)) "91-120",
        SUM(decode(trunc(((sysdate - TABLE_A.date_time) -1) / 60), 2, 1, 0)) "121-180",
        SUM(decode(trunc(((sysdate - TABLE_A.date_time)) / 181), 0, 0, 1)) ">180"
FROM Table_A
WHERE ...
GROUP BY TABLE_A.status_cd

Answer 1

Assuming you are happy to see these summaries across the page, the simplest way to do this would be:

select sum(DECODE(STATUS_CD, 0,1, 0)) Status_A,
       sum(DECODE(STATUS_CD, 1,1, 0)) Status_B,
       sum(DECODE(STATUS_CD, 2,1, 3,1, 0)) Status_C_D,
       sum(DECODE(STATUS_CD, 2,1, 0)) Status_C,
       sum(DECODE(STATUS_CD, 3,1, 0)) Status_D,
       sum(DECODE(STATUS_CD, 4,1, 0)) Status_E
FROM table_a ...

EDIT: If you need to see the results down the page, try:

select "status", 
        SUM(decode(trunc(((sysdate - "date_time") +8) / 8), 1, 1, 0)) "0-7",
        SUM(decode(trunc(((sysdate - "date_time") +8) / 8), 2, 1, 0)) "8-15",
        SUM(decode(trunc(((sysdate - "date_time") +8) / 8), 3, 1, 0)) "16-23",
        SUM(decode(trunc(((sysdate - "date_time") +9) / 8), 4, 1, 0)) "24-30",
        SUM(decode(trunc(((sysdate - "date_time") -1) / 30), 1, 1, 0)) "31-60",
        SUM(decode(trunc(((sysdate - "date_time") -1) / 30), 2, 1, 0)) "61-90",
        SUM(decode(trunc(((sysdate - "date_time") -1) / 30), 3, 1, 0)) "91-120",
        SUM(decode(trunc(((sysdate - "date_time") -1) / 60), 2, 1, 0)) "121-180",
        SUM(decode(trunc(((sysdate - "date_time")) / 181), 0, 0, 1)) ">180"
from
(SELECT DECODE(coalesce(d.dummy_status, a.STATUS_CD), 
         'X', 'Status_C_D'
         '0', 'Status_A',
         '1', 'Status_B',
         '2', 'Status_C',
         '3', 'Status_D',
         '4', 'Status_E',
         'Unknown') "status",
         a."date_time"
 FROM table_a a
 LEFT JOIN (select '2' status_cd, '2' dummy_status from dual union
            select '2' status_cd, 'X' dummy_status from dual union
            select '3' status_cd, '3' dummy_status from dual union
            select '3' status_cd, 'X' dummy_status from dual) d
        ON a.status_cd = d.status_cd
 ...
) group by "status"