SQL Search/Compare 关键字和 Orderby 相似度

Question

我接到了这个挑战，要根据页面的关键字做一个相关的页面显示。

应用程序应该根据用户正在访问的当前页面的关键字显示相关页面。它将检查页面当前具有的关键字字符串，例如它有 3 个关键字

"Tag,Keyword,Test"

它应该检查数据库中的其他页面是否有相同的关键字。例如，结果将是另外 2 个页面，其中包含一些关键字（不是全部）

PageName | Keyword

 Subpage1| Test,Tag
 Subpage2| Tag

我也想按相关性排序，匹配的关键词越多相关性越高。

Answer 1

试试这个

函数

CREATE FUNCTION [dbo].[fn_Split](@text varchar(8000), @delimiter varchar(20))
RETURNS @Strings TABLE
(   
  position int IDENTITY PRIMARY KEY,
  value varchar(8000)  
)
AS
BEGIN

DECLARE @index int
SET @index = -1

WHILE (LEN(@text) > 0)
  BEGIN 
    SET @index = CHARINDEX(@delimiter , @text) 
    IF (@index = 0) AND (LEN(@text) > 0) 
      BEGIN  
        INSERT INTO @Strings VALUES (@text)
          BREAK 
      END 
    IF (@index > 1) 
      BEGIN  
        INSERT INTO @Strings VALUES (LEFT(@text, @index - 1))  
        SET @text = RIGHT(@text, (LEN(@text) - @index)) 
      END 
    ELSE
      SET @text = RIGHT(@text, (LEN(@text) - @index))
    END
  RETURN
END

查询

declare @keyword nvarchar(max) = 'tag,test'

select tabl1.pageName,table1.Keyword,count(keywordname.value) as MatchCount
from table1 inner join 
(select value from fn_Split(@keyword,',')) as keywordname on
table1.keyword like '%'+keywordname.value+'%' 
group by tabl1.pageName,table1.Keyword
order by MatchCount desc

Answer 2

您可以使用 CTE 和 Split 函数使用 Cross Apply

;WITH CtePrimary AS(
    SELECT
        LTRIM(RTRIM(s.Data)) AS Keyword,PageName
    FROM PageKeywords k
    CROSS APPLY dbo.Split(k.Primary_Kwd, ",") s
),CteSecondry as (
select Distinct PageName,


 STUFF(
         (SELECT ', ' + convert(varchar(10), t2.keywords, 120)
          FROM CtePrimary t2
          where t1.PageName
         = t2.PageName
          FOR XML PATH (''))
          , 1, 1, '')  AS Keywords 
          ,Count(distinct Keywords) AS KeyCount
from CtePrimary t1 where Keyword In (select Data From dbo.Split(@keywords,',' )) )

select PageName,Keywords from CteSecondry  order by KeyCount desc

SQL Search/Compare 关键字和 Orderby 相似度

SQL Search/Compare Keywords and Orderby similarity

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