Return by date

Question

Hi,
I wanted to creat a report that return the number of messages by a certain time, order by departement: i have in a table a creat_date, id_message and a id_departement and need an output like this:
------------------------<24hours---------1day--------2-3days---------- Total
departement A ----------1---------------2----------------2--------------5
departement B-----------3---------------3----------------1--------------7
departement C-----------2---------------2----------------2--------------6
I try to make somethink like this:
select id_departament,
count(decode(creat_date,'sysdate',id_message,null)) "<24 Hours",
count(decode(creat_date,'sysdate',id_message,null)) "1 DAY",
count(decode(creat_date,'sysdate',id_message,null)) "2-3 DAYS",
count(id_message) Total
from V_MESSAGE
group by id_departament
order by id_departament
The problem is , that count(decode(creat_date,'sysdate',id_message,null)) "<24 Hours",
return 0 .........and when i make count(decode(creat_date,'07.12.17',id_message,null)) "<24 Hours", it returns the value of the number of messages in this date .
What's wrong with this sysdate??
Thank's

Answer 1

use case:
case when sysdate - create_date < 1 then '< 24 hours'
     when sysdate - create_date < 2 then '1 day'
     when sysdate - create_date < 4 then '2-3 days'
     else 'over 3 days'
end periodRegards
Etbin
you can group by expression:
  with
  your_table as
  (select id_department,rownum id_message,creat_date
     from (select ceil(dbms_random.value(0,5)) id_department,sysdate - dbms_random.value(0,5) creat_date
             from dual
           connect by level <= 20
           order by creat_date
  groupped as
  (select id_department,
          case when sysdate - creat_date < 1 then '< 24 hours'
               when sysdate - creat_date < 2 then '1 day'
               when sysdate - creat_date < 4 then '2-3 days'
               else '3+ days'
          end period,
          count(*) the_count
     from your_table
    group by id_department,
             case when sysdate - creat_date < 1 then '< 24 hours'
                  when sysdate - creat_date < 2 then '1 day'
                  when sysdate - creat_date < 4 then '2-3 days'
                  else '3+ days'
             end
  pivoted as
  (select id_department,
          max(decode(period,'< 24 hours',the_count,null)) "< 24 hours",
          max(decode(period,'1 day',the_count,null)) "1 day",
          max(decode(period,'2-3 days',the_count,null)) "2-3 days",
          max(decode(period,'3+ days',the_count,null)) "3+ days"
     from groupped
    group by id_department
  select id_department,"< 24 hours","1 day","2-3 days","3+ days",
         nvl("< 24 hours",0) + nvl("1 day",0) + nvl("2-3 days",0) + nvl("3+ days",0) total 
    from pivoted
   order by id_department
=====================================================
ID_DEPARTMENT|< 24 hours|1 day|2-3 days|3+ days|TOTAL
=====================================================
            1|         1|     |       3|      1|    5
            2|          |    2|       1|       |    3
            3|         1|     |       1|       |    2
            4|          |     |       1|      2|    3
            5|         2|    1|       4|       |    7Regards
Etbin
Message was edited by:Etbin
user596003