如何获取SQL Server查询中返回的一组多行中最常见的n个单词?

了解如何声明性地执行此操作(即不使用 while 循环),看看我的答案(所有东西的代码): Build an ASCII chart of the most commonly used words in a given text

CREATE FUNCTION dbo.Split(@String varchar(8000), @Delimiter char(1))     
returns @temptable TABLE (items varchar(8000))     
as     
begin     
    declare @idx int     
    declare @slice varchar(8000)     

    select @idx = 1     
        if len(@String)<1 or @String is null  return     

    while @idx!= 0     
    begin     
        set @idx = charindex(@Delimiter,@String)     
        if @idx!=0     
            set @slice = left(@String,@idx - 1)     
        else     
            set @slice = @String     

        if(len(@slice)>0)
            insert into @temptable(Items) values(@slice)     

        set @String = right(@String,len(@String) - @idx)     
        if len(@String) = 0 break     
    end 
return     
end

您应该从游标或其他地方调用这个函数;在其内部,只需使用以下内容:

insert into #tmp (word) select * from dbo.split(' ', @row)

select top 10 count(*) as number, word from separated_words_table order by number

Source here

另一种方式借自 here )

WITH Sentences AS
(
SELECT 'quick brown fox' AS Sentence UNION ALL
SELECT 'slow yellow fox' UNION ALL
SELECT 'slow green fox'
),
Xmlified AS
(
    SELECT
       CAST('<M>' + REPLACE(Sentence,' ','</M><M>') + '</M>' AS XML)  AS xSentence
FROM Sentences
),
Words AS
(
SELECT
 Split.a.value('.', 'VARCHAR(100)') AS word
FROM Xmlified
CROSS APPLY xSentence.nodes('/M') Split(a)
)
SELECT COUNT(*) AS C, word FROM Words
GROUP BY word
ORDER BY C DESC