How to display rollup data in new column?

Question

I have the following query which returns the number of android questions per each day on StackOverflow in the year of 2011. I want to get the sum of all the questions asked during the year 2011. For this I am using ROLLUP.

select 
  year(p.CreationDate) as [Year],
  month(p.CreationDate) as [Month],
  day(p.CreationDate) as [Day],
  count(*) as [QuestionsAskedToday]
from Posts p 
  inner join PostTags pt on p.id = pt.postid
  inner join Tags t on t.id = pt.tagid
where 
  t.tagname = 'android' and
  p.CreationDate > '2011-01-01 00:00:00'
group by year(p.CreationDate), month(p.CreationDate),day(p.CreationDate)
​with rollup
order by year(p.CreationDate), month(p.CreationDate) desc,day(p.CreationDate) desc​

This is the output:

The sum of all questions asked on each day in 2011 is being displayed in the QuestionsAskedToday column itself.

Is there a way to display the rollup in a new column with an alias?

Link to the query

Answer 1

You could take an approach like this: Example

SELECT 
   YEAR(p.CreationDate) AS 'Year'
   , CASE
        WHEN GROUPING(MONTH(p.CreationDate)) = 0
           THEN CAST(MONTH(p.CreationDate) AS VARCHAR(2))
        ELSE 'Totals:'
     END AS 'Month'
   , CASE
        WHEN GROUPING(DAY(p.CreationDate)) = 0
        THEN CAST(DAY(p.CreationDate) AS VARCHAR(2))
        ELSE 'Totals:'
     END AS [DAY]
   , CASE
        WHEN GROUPING(MONTH(p.CreationDate)) = 0
           AND GROUPING(DAY(p.CreationDate)) = 0 
              THEN COUNT(1)
     END AS 'QuestionsAskedToday'
   , CASE
        WHEN GROUPING(MONTH(p.CreationDate)) = 1
           OR GROUPING(DAY(p.CreationDate)) = 1
              THEN COUNT(1)
     END AS 'Totals'
FROM Posts AS p
INNER JOIN PostTags AS pt ON p.id = pt.postid
INNER JOIN Tags AS t ON t.id = pt.tagid
WHERE t.tagname = 'android'
   AND p.CreationDate >= '2011-01-01'
GROUP BY ROLLUP(YEAR(p.CreationDate)
   , MONTH(p.CreationDate)
   , DAY(p.CreationDate))
ORDER BY YEAR(p.CreationDate)
   , MONTH(p.CreationDate) DESC
   , DAY(p.CreationDate) DESC​​​​​​​

If this is what you wanted, the same technique can be applied to Years as well to total them in the new column, or their own column, if you want to query for multiple years and aggregate them.