使用功能在这里找到: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;
你可以做这样的事情
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
基本上你正在创建Keyword
值的爆发表。然后搜索查看哪些包含搜索字符串中的Keyword
,按主键进行分组并按命中次序排序。
你可以将它与'replace(关键词,',','')'进行比较。 – SomeJavaGuy
这是在将多个值存储在单个列中时出现的众多问题之一,请考虑一个设计,其中每个关键字位于关键字表中的自己的行中,并且使用一对多表将各个关键字拼接在一起。 –
嗨亚历克斯,这是我的未来计划,因为我遗憾地继承了这个项目。 –