SQL_函数⽐较两个字符串的相似度
USE [SooilSemanticsDB_ImportData]
GO
/****** Object:  UserDefinedFunction [dbo].[get_semblance_By_2words]    Script Date: 2015/6/18 15:44:12 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
create  function [dbo].[get_semblance_By_2words]
(
@word1 varchar(500),
@word2 varchar(500)
)
returns nvarchar(4000)
as
begin
declare @re int
declare @maxLenth int
declare @i int,@l int
字符串比较函数实现declare @tb1 table(child varchar(500))
declare @tb2 table(child varchar(500))
set @i=1
set @l=1
set @maxLenth=len(@word1)
if len(@word1)<len(@word2)
begin
set @maxLenth=len(@word2)
end
while @l<=len(@word1)
begin
while @i<=len(@word1) and @i<=len(@word1)-@l+1
begin
insert @tb1 (child) values( SUBSTRING(@word1,@l,@i) )
set @i=@i+1
end
set @i=1
set @l=@l+1
end
set @i=1
set @l=1
while @l<=len(@word2)
begin
while @i<=len(@word2) and @i<=len(@word2)-@l+1
begin
insert @tb2 (child) values( SUBSTRING(@word2,@l,@i) )
set @i=@i+1
end
set @i=1
set @l=@l+1
end
select @re=isnull(max( len(a.child)*100/  @maxLenth ) ,0) from @tb1 a, @tb2 b where a.child=b.child
return @re
end

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