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Shows the trend for your favourite tag

Q&A for amateur radio enthusiasts

--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
    WHERE Posts.PostTypeId = 1
  ) p
GROUP BY DATEDIFF(month, '', p.CreationDate)
ORDER BY DATEDIFF(month, '', p.CreationDate);

SELECT p1.[date], p1.[##TagName##Count] * 100.0 / p1.[totalCount] [Percentage of questions tagged &lt;##TagName##&gt;]
FROM @PostCountByMonth p1 
ORDER BY p1.[date]

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edited apr 1 14 eBusiness

created dec 13 10 prof3ta