Generate non matching rows without outerjoin

Question

Oracle Database 11g
I have a query
select B.YEAR_NUMBER ,SUM(NVL(TOTAL_COUNT,0))
from ODS_PERMIT_MV a, DATE_DIM b
where a.PERMIT_ISSUE_DATE_KEY = b.DATE_KEY
and B.CALENDAR_DATE<=trunc(sysdate)
group by B.YEAR_NUMBER
which gives me records in this form
YEAR| COUNT
2011     328
2012     684
However I want result set like
YEAR| COUNT
2009 0
2010 0
2011     328
2012     684
I can get this result with an outer join
select B.YEAR_NUMBER ,SUM(NVL(TOTAL_COUNT,0))
from ODS_PERMIT_MV a, DATE_DIM b
where a.PERMIT_ISSUE_DATE_KEY *(+)* = b.DATE_KEY
and B.CALENDAR_DATE<=trunc(sysdate)
group by B.YEAR_NUMBER
but this again is not acceptable.
Another solution was this
select YEAR_NUMBER,SUM(TOTAL_COUNT) from
select B.YEAR_NUMBER as "YEAR_NUMBER" ,SUM(NVL(TOTAL_COUNT,0)) as "TOTAL_COUNT"
from ODS_PERMIT_MV a, DATE_DIM b
where a.PERMIT_ISSUE_DATE_KEY = b.DATE_KEY
and B.CALENDAR_DATE<=trunc(sysdate)
group by B.YEAR_NUMBER
union
select to_number(to_char(add_months(sysdate,(level-1)*-12),'YYYY')),0
from dual
connect by level <=5
group by YEAR_NUMBER
order by YEAR_NUMBER desc
Still complex, but is there any other way to achieve this?
Regards,
Franklin
Edited by: user486459 on Dec 20, 2012 7:59 AM

Answer 1

Hi,
>
<<outer-join-query>>
but this again is not acceptable.
>
Why? Could you please explain this further. I think it's a simple(/the simplest) way to get your result.
I tried a few other ways, but nothing looks as nice as an outer join. Brief and easy to understand.
-- I tried to break this down to only two columns
-- because you provided no scripts; hopefully I didn't
-- miss anything
-- this is probably a materialized view in your situation
Create Table Ods_Permit_Mv (
   Year_Number    Number(4)
   ,total_count   number
truncate table Ods_Permit_Mv;
-- test-data
Insert Into Ods_Permit_Mv Values (2011,200);
Insert Into Ods_Permit_Mv Values (2011,138);
Insert Into Ods_Permit_Mv Values (2012,100);
Insert Into Ods_Permit_Mv Values (2012,200);
Insert Into Ods_Permit_Mv Values (2012,300);
Insert Into Ods_Permit_Mv Values (2012,84);
commit;
Create Table Date_Dim(
   Year_Number    Number(4) Primary Key
Insert Into Date_Dim Values(2009);
Insert Into Date_Dim Values(2010);
Insert Into Date_Dim Values(2011);
Insert Into Date_Dim Values(2012);
Commit;
-- this is your solution for matching rows only
select B.YEAR_NUMBER ,SUM(NVL(TOTAL_COUNT,0))
From Ods_Permit_Mv A, Date_Dim B
Where A.Year_Number = B.Year_Number
And B.Year_Number<=extract(year from Sysdate)
group by B.YEAR_NUMBER;
-- is this version really better than an outer-join??? or more understandable???
Select   B.Year_Number
         ,(Select sum(  Case
                        When Year_Number = B.Year_Number
                        then
                           Sum(Nvl(Total_Count,0))
                        Else
                           0
                        end)
         From Ods_Permit_Mv A
         group by year_number) as total_count
From Date_Dim B
where B.Year_Number <= extract(year from Sysdate);
-- or this??? (union-all-idea taken from Keith Jamieson)
With help as(
   select B.YEAR_NUMBER year_number, SUM(NVL(TOTAL_COUNT,0)) total_count
   From Ods_Permit_Mv b
   group by B.YEAR_NUMBER
   Union All
   Select  Year_Number Year_Number,  0 Total_Count
   From Date_Dim)   --end with-clause
Select Help.Year_Number, Sum(Help.Total_Count) total_count
From Help
Where Year_Number <=Extract(Year From Sysdate)
group by help.year_number;
-- why don't you like the idea of an outer join?
Select Dim.Year_Number, Sum(Nvl(Fact.Total_Count,0)) Total_Count
From  Date_Dim Dim
      Left Outer Join
      Ods_Permit_Mv Fact
         On (Dim.Year_Number = Fact.Year_Number)
group by Dim.Year_Number;At the end of one post you wrote
>
Still complex, but is there any other way to achieve this?
>
Yes there are, obviously. But why ...
Bye
stratmo
PS: For you further postings please take a look at
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and
[url https://forums.oracle.com/forums/ann.jspa?annID=719]Announcement: Forums Etiquette / Reward Points please because this makes helping easier for the very good ones on this forum. Obviously not me :(