Home Database Mysql Tutorial 实现按关健字模糊查询,并按匹配度排序的SQL语句

实现按关健字模糊查询,并按匹配度排序的SQL语句

Jun 07, 2016 pm 05:59 PM
fuzzy query

SQL语句实现按关健字模糊查询,并按匹配度排序

代码如下:
IF OBJECT_ID('TB')IS NOT NULL DROP TABLE TB
GO
CREATE TABLE tb (ID INT IDENTITY(1,1),VALUE NVARCHAR(100))
INSERT tb SELECT N'中国'
UNION ALL SELECT N'中国人'
UNION ALL SELECT N'中国人民'
UNION ALL SELECT N'日本'
UNION ALL SELECT N'日本人'
UNION ALL SELECT N'我的心中有人姑娘'
UNION ALL SELECT N'人民网'
UNION ALL SELECT N'中国是个伟大的国家'
UNION ALL SELECT N'我们都是中国人,都是炎黄子孙,都是龙人传人'
IF OBJECT_ID('fn_SplitStringToROWS')IS NOT NULL DROP FUNCTION fn_SplitStringToROWS
GO
CREATE FUNCTION fn_SplitStringToROWS
(
@str NVARCHAR(100)
)
RETURNS @t TABLE(v NVARCHAR(2))
AS
BEGIN
DECLARE @i INT
SET @i=1
WHILE @iBEGIN
INSERT @t SELECT SUBSTRING(@str,@i,1)
SET @i=@i+1
END
RETURN
END
GO
SELECT * FROM DBO.fn_SplitStringToROWS(N'中国人')
DECLARE @searchSTR NVARCHAR(20)
SET @searchSTR=N'中国人'
SELECT ID,[VALUE] FROM tb a
INNER JOIN fn_SplitStringToROWS(@searchSTR) b
ON CHARINDEX(b.v,a.VALUE)>0
WHERE VALUE LIKE N'%[中国人]%'
GROUP BY ID,VALUE
ORDER BY COUNT(DISTINCT v) DESC
DROP TABLE tb

/*
v
----




(3 個資料列受到影響)

ID VALUE
----------- ----------------------------------------------------------------------------------------------------
2 中国人
3 中国人民
9 我们都是中国人,都是炎黄子孙,都是龙人传人
6 我的心中有人姑娘
1 中国
8 中国是个伟大的国家
5 日本人
7 人民网

(8 個資料列受到影響)
*/
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