Question

I have following query working :

SELECT
COUNT(id), AgeRange
FROM
(
select
id,
case
when age < 0 then 'less than 0'
when age >= 0 and age <=30 then '0-30'
when age >= 31 and age <=60 then '31-60'
when age >= 61 and age <=90 then '61-90'
when age >= 91 then '91+'
when age = null then 'NO INFORMATION'
else 'no catagory'
end AS AgeRange
from queue 
where DATE between '01-Apr-2011' and '05-May-2011'
) T
GROUP BY
AgeRange;

Now my requirement is that, I want these result to be printed always in a sequence, first for less than 0, than for 31-60 and so on.

Even if get count 0 for any interval say 31-60. It should return 0 for that interval. Can anyone help.

Further clarification: what I want is if for any case I am getting zero count it should also print that.

In my table of database for this query it is not displaying the ‘less than 0’ case:

COUNT(ID) AGERANGE       AGERANGESEQUENCE
-------------- -------------- ----------------
     11139 0-30                          2
      2292 31-60                         3
       329 61-90                         4
      1078 91+                           5
       746 NO INFORMATION                6

Its not showing me the first row of count 0.

I want that too, so that I can get a well defined table structure.

Answer 1

If you want to order by that column – just add an

ORDER BY AgeRange

after the GROUP BY AgeRange clause:

SELECT
   COUNT(id), AgeRange
FROM
   ( ..... ) T
GROUP BY
    AgeRange
ORDER BY
    AgeRange

If that sequence doesn’t work out for you, then you’d have to add a second CASE statement to define a AgeRangeSequence to your inner select and then order by that column:

SELECT
     COUNT(id), AgeRange, AgeRangeSequence
FROM
     (SELECT
          id,
          CASE
             WHEN age < 0 THEN 'less than 0'
             WHEN age >= 0 AND age <= 30 THEN '0-30'
             WHEN age >= 31 AND age <= 60 THEN '31-60'
             WHEN age >= 61 AND age <= 90 THEN '61-90'
             WHEN age >= 91 THEN '91+'
             WHEN age IS NULL THEN 'NO INFORMATION'
             ELSE 'no category'
          END AS AgeRange,
          CASE
             WHEN age < 0 THEN 1
             WHEN age >= 0 AND age <= 30 THEN 2
             WHEN age >= 31 AND age <= 60 THEN 3
             WHEN age >= 61 AND age <= 90 THEN 4
             WHEN age >= 91 THEN 5
             WHEN age IS NULL THEN 6   
             ELSE 7
           END AS AgeRangeSequence,
    FROM dbo.queue 
    WHERE [DATE] BETWEEN '01-Apr-2011' AND '05-May-2011'
   ) T
GROUP BY
    AgeRange, AgeRangeSequence
ORDER BY
    AgeRangeSequence

PS: in your CASE statement, you should check for WHEN age IS NULL and not use WHEN age = NULL since you cannot compare to NULL using the normal comparison operators!