Most common tags with short, long, or missing excerpt or wiki

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Lists the most commonly used tags with empty/missing/short tag wikis (wiki or excerpt). Can also identify tag wikis that are over a specified length. Enter -1 for all parameters to match all tags. Tags that have been synonymized are excluded.

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-- Wiki excerpts have to have between 20 and 460 characters.
-- Full tag wikis have to have at least 30 characters.

-- MaxBodyLength: Body shorter than "Set to 0 or -1 to disable"
DECLARE @max_body_len int = ##MaxBodyLength:int?0##
-- MaxExcerptLength: or excerpt shorter than "Set to 0 or -1 to disable"
DECLARE @max_excerpt_len int = ##MaxExcerptLength:int?1##
-- MinBodyLength: or body longer than "Set to -1 to disable"
DECLARE @min_body_len int = ##MinBodyLength:int?12000##
-- MinExcerptLength: or excerpt longer than "Set to -1 to disable"
DECLARE @min_excerpt_len int = ##MinExcerptLength:int?-1##
-- PlotMinimum: Plot: Start at
DECLARE @plot_min int = ##PlotMinimum:int?0##
-- Bin: Plot: Bin size
DECLARE @bin int = ##Bin:Int?1##
-- BinCount: Plot: Number of bins "Maximum 999"
DECLARE @bin_count int = ##BinCount:int?20##

SELECT t.Count,
    t.TagName,
    coalesce(len(pe.Body),0) as [Excerpt length],
    coalesce(len(pw.Body),0) as [Wiki length],
    pe.CreationDate,
    -- Synonym target and ApprovalDate only exist for tag synonyms.
    tssrc.TargetTagName as [Synonym target],
    tssrc.ApprovalDate
INTO #TagList
FROM Tags t
LEFT JOIN Posts pe on pe.Id = t.ExcerptPostId
LEFT JOIN Posts pw on pw.Id = t.WikiPostId
LEFT JOIN TagSynonyms tssrc on tssrc.SourceTagName = t.TagName
LEFT JOIN Tags tgt on tssrc.TargetTagName = tgt.TagName
WHERE -- match everything if all parameters are disabled
    (@max_body_len <= 0 and @max_excerpt_len <= 0
     and @min_body_len = -1 and @min_excerpt_len = -1)
    or (coalesce(len(pe.Body),0) < @max_excerpt_len -- short excerpt
     or coalesce(len(pw.Body),0) < @max_body_len    -- short wiki
     or len(pe.Body) > nullif(@min_excerpt_len,-1)  -- long excerpt
     or len(pw.Body) > nullif(@min_body_len,-1))    -- long wiki
     and (tssrc.SourceTagName is null   -- exclude tags that are synonyms
          or tssrc.ApprovalDate is null -- unless it was never approved
          or tgt.TagName is null)       -- or the synonym target is gone

-- Make a list of integers
-- Based on http://stackoverflow.com/questions/2157282/generate-days-from-date-range/2157776#2157776
select num
into #Integers
from
 (select @plot_min + (a.a + (10 * b.a) + (100 * c.a)) * @bin as num
  from (select 0 as a union all select 1 union all select 2 union all select 3 union all select 4 union all select 5 union all select 6 union all select 7 union all select 8 union all select 9) as a
    cross join (select 0 as a union all select 1 union all select 2 union all select 3 union all select 4 union all select 5 union all select 6 union all select 7 union all select 8 union all select 9) as b
    cross join (select 0 as a union all select 1 union all select 2 union all select 3 union all select 4 union all select 5 union all select 6 union all select 7 union all select 8 union all select 9) as c
 ) a
where a.num <= (select max(Count) from #TagList where Count < (@plot_min + @bin*@bin_count))

SELECT *
FROM #TagList
ORDER BY Count desc,
    [Excerpt length] asc,
    [Wiki length] asc,
    TagName

SELECT num as [Number of questions],
    count(Count) as [Number of tags with this many questions]
FROM #TagList
RIGHT JOIN #Integers on Count between num and (num+@bin-1)
GROUP BY num
ORDER BY num

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