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DECLARE @TagName varchar(255) = '##TagName##';

DECLARE @PostCountByMonth TABLE
(
  [date] datetime,
  [totalCount] int,
  [##TagName##Count] int,
  UNIQUE CLUSTERED ([date])
);

INSERT INTO @PostCountByMonth
SELECT dateadd(month, DATEDIFF(month, '', p.CreationDate), '') [date],
      count(*) [totalCount],
      count(p.[IsTag]) [##TagName##Count]
FROM
  (
    SELECT Posts.CreationDate, (case when Posts.Tags LIKE '%<##TagName##>%' then 1 else null end) [IsTag]
    FROM Posts
  ) p
GROUP BY DATEDIFF(month, '', p.CreationDate)
ORDER BY DATEDIFF(month, '', p.CreationDate);

SELECT p1.[date], sum(p1.[##TagName##Count])
FROM @PostCountByMonth p1
GROUP BY p1.[date]

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edited feb 1 13 anonymous

created dec 13 10 prof3ta