使用功能在這裏找到:http://sqlperformance.com/2012/07/t-sql-queries/split-strings
CREATE FUNCTION dbo.SplitStrings_Moden
(
@List NVARCHAR(MAX),
@Delimiter NVARCHAR(255)
)
RETURNS TABLE
WITH SCHEMABINDING AS
RETURN
WITH E1(N) AS (SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1
UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1
UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1),
E2(N) AS (SELECT 1 FROM E1 a, E1 b),
E4(N) AS (SELECT 1 FROM E2 a, E2 b),
E42(N) AS (SELECT 1 FROM E4 a, E2 b),
cteTally(N) AS (SELECT 0 UNION ALL SELECT TOP (DATALENGTH(ISNULL(@List,1)))
ROW_NUMBER() OVER (ORDER BY (SELECT NULL)) FROM E42),
cteStart(N1) AS (SELECT t.N+1 FROM cteTally t
WHERE (SUBSTRING(@List,t.N,1) = @Delimiter OR t.N = 0))
SELECT Item = SUBSTRING(@List, s.N1, ISNULL(NULLIF(CHARINDEX(@Delimiter,@List,s.N1),0)-s.N1,8000))
FROM cteStart s;
你可以做這樣的事情
SELECT a.pk, COUNT(*) AS hits
FROM Table AS a
CROSS APPLY dbo.SplitStrings_Moden(a.Keywords, ',') b
WHERE
CHARINDEX(b.Item, 'this is a search string') > 0
GROUP BY a.pk
ORDER BY COUNT(*) DESC
基本上你正在創建Keyword
值的爆發表。然後搜索查看哪些包含搜索字符串中的Keyword
,按主鍵進行分組並按命中次序排序。
你可以將它與'replace(關鍵詞,',','')'進行比較。 – SomeJavaGuy
這是在將多個值存儲在單個列中時出現的衆多問題之一,請考慮一個設計,其中每個關鍵字位於關鍵字表中的自己的行中,並且使用一對多表將各個關鍵字拼接在一起。 –
嗨亞歷克斯,這是我的未來計劃,因爲我遺憾地繼承了這個項目。 –