How to get and populate Zero '0' if no record found in SSRS Report 2005

Question

I am using SSRS report to get the result based on the category and the category value changed to Yes,No,Not Met by replacing with 1 = Yes, 2 = No, 3 = Not Met. The query is,

SELECT (
    CASE
        WHEN    A = '99' or B = '99'    THEN 3
        WHEN    C + D >= 10 THEN 1
        ELSE 2
    END) as Category,

and the result is,

             N     %     N    %    N     % 
Not Met      10    11%   5    7%   45    20% 
Yes          4     5%    30   4%   8     6%
No           10    11%   5    7%   45    20% 

and if for example no result found for "Not Met", i want result like this with Zeros instead.

             N     %     N    %    N     % 
Not Met      0     0%    0    0%   0     0% 
Yes          4     5%    30   4%   8     6%
No           10    11%   5    7%   45    20%

I have tried Left Join in the query but it will bring extra record. i am kind of stuck and don't know how to get Zero '0' result if no record found for Yes, No or Not Met. My query is,

SELECT (
    CASE
        WHEN    A = '99' or B = '99'    THEN 3
        WHEN    C + D >= 10 THEN 1
        ELSE 2
        END
       ) as Category, [Table A].*, [Table B].*
       FROM Table A inner join Table B on Table A.id = Table B.id
       WHERE
        (
            Condition and Field is not null
        ) 

Please help as this is my final project and i am stuck.

Thanks.

MY SAMPLE DATA...

MY SAMPLE DATA

TABLE A
=======  

ID -------REFNO-------BGDATE-------SBRST-------xx   xx ...
--      ---------   --  --          
1209-------23-------09/09/1900-------13-------XX    XX
3453-------12-------14/02/1978-------10-------XX    XX
3476-------56-------02/03/1980-------10 -------XX   XX


TABLE B
=======

ID-------- CITY  -------xx  xx ...    xx
--      --      --  --
1209-------Glasgow-------xx-------X
3453-------Edinburgh-----xx-------X
3476-------Manchester----xx-------X

---

SELECT
(
CASE
    WHEN BGDATE = '09/09/1900' THEN 3

    --I tried this to get Value 3, if no condition met but no success 
    WHEN NOT EXISTS(BGDATE = '09/09/1900') THEN 3

    WHEN SBRST IN ('11','12') THEN 1
    ELSE 2
    END
) as Category, [Table - A].*, [Table - B].*
 FROM [Table - A] inner join [Table - A] on [Table - A].id = [Table - A].ID

 ----> For Ian <-----This is sample data of my WHERE clause
    WHERE
(   
        (
            SBRST IN ('4','5','6','7','11','12') AND SBRST<>'99
            AND NOT
                (
                    EXTNT IN ('2','3','4','99') OR 
                    HOR IN ('2','99') OR
                    (DATEDIFF(day,CHDATE1,CHENDATE1)>='42')
                )
        )
        AND
        (
            SBRST IS NOT NULL AND
            EXTNT IS NOT NULL AND
            HOR IS NOT NULL
        )
)

order by Category desc

---

RESULT
======
category----------ID----------REFNO----------BGDATE----------SBRST----------xx
3-----------------1209----------23----------09/09/1900----------13----------XX
2-----------------3453----------12----------14/02/1978----------10----------XX
2-----------------3476----------56----------02/03/1980----------10----------Xx

Points to be considered:

1) The above is my sample data.

2) Table A and B has inner joins on ID will bring the results.

3) Populating the Category based on the above SELECT condition, but the problem is, *if there is no condition matching, no category gets populated but i want the missing category as well. In this case it is "1".

I want some thing like this.

EXPECTED RESULT
======
category----------ID----------REFNO----------BGDATE----------SBRST----------xx
3-----------------1209----------23----------09/09/1900----------13----------XX
2-----------------3453----------12----------14/02/1978----------10----------XX
2-----------------3476----------56----------02/03/1980----------10----------XX
1-----------------0-------------0-----------NULL----------------0-----------NULL

Another solution could be, if i create another table with all the 3 categories in it and then use RIGHT OUTER JOIN to get the results but i do not know HOW??

Answer 1

I had this issue once. I did a quick fix by creating a temp table and inserting the results into the temp table and then checked to see if any of the three categories were missing from the temp table then inserted a row into the temp table with the desired default values in there. Below is an example code (just to give you an idea)

SELECT (
    CASE
        WHEN    A = '99' or B = '99'    THEN 3
        WHEN    C + D >= 10 THEN 1
        ELSE 2
        END
       ) as Category, [Table A].*
       INTO #Temp
       FROM [Table A]

IF NOT EXISTS (SELECT 1 FROM #Temp WHERE Category=1)
BEGIN
    INSERT INTO #Temp (Category,column1,column2,column3,etc...) VALUES ( 1,0,0,0,etc...
    )
END
IF NOT EXISTS (SELECT 1 FROM #Temp WHERE Category=2)
BEGIN
    INSERT INTO #Temp (Category,column1,column2,column3,etc...) VALUES ( 2,0,0,0,etc...
    )
END
IF NOT EXISTS (SELECT 1 FROM #Temp WHERE Category=3)
BEGIN
    INSERT INTO #Temp (Category,column1,column2,column3,etc...) VALUES ( 3,0,0,0,etc...
    )
END

SELECT * FROM #Temp 

DROP TABLE #temp

Answer 2

You can use a query something like this:

select cat.Category
  , a.ID
  , b.CITY
  , a.BGDATE
  , a.REFNO
  , a.SBRST
from
  (
    select Category = 1
    union all
    select Category = 2
    union all
    select Category = 3
  ) cat
  left join
  (
    [Table - A] a
      inner join [Table - B] b on a.ID = b.ID
      cross apply
      (
        SELECT Category = CASE WHEN a.BGDATE = '09/09/1900' THEN 3
          WHEN a.SBRST IN ('11','12') THEN 1
          ELSE 2
          END
      ) c
  ) on c.Category = cat.Category
order by Category desc

I've created a SQL Fiddle which shows this gives the required results.

The key point to note is that I am using a subquery to create the required categories (the cat subquery), then using a left join to join this to the actual results - this makes sure all required categories are always included.