SQL提取数字，提取英文，提取中文，过滤重复字符方法

--提取数字

IF OBJECT_ID('DBO.GET_NUMBER2') IS NOT NULL

DROP FUNCTION DBO.GET_NUMBER2

GO

CREATE FUNCTION DBO.GET_NUMBER2(@S VARCHAR(100))

RETURNS VARCHAR(100)

AS

BEGIN

WHILE PATINDEX('%[^0-9]%',@S) > 0

BEGIN

set @s=stuff(@s,patindex('%[^0-9]%',@s),1,'')

END

RETURN @S

END

GO

--测试

PRINT DBO.GET_NUMBER('呵呵ABC123ABC')

GO

--123

--------------------------------------------------------------------

--提取英文

IF OBJECT_ID('DBO.GET_STR') IS NOT NULL

DROP FUNCTION DBO.GET_STR

GO

CREATE FUNCTION DBO.GET_STR(@S VARCHAR(100))

RETURNS VARCHAR(100)

AS

BEGIN

WHILE PATINDEX('%[^a-z]%',@S) > 0

BEGIN

set @s=stuff(@s,patindex('%[^a-z]%',@s),1,'')

END

RETURN @S

END

GO

--测试

PRINT DBO.GET_STR('呵呵ABC123ABC')

GO

--------------------------------------------------------------------

--提取中文

IF OBJECT_ID('DBO.CHINA_STR') IS NOT NULL

DROP FUNCTION DBO.CHINA_STR

GO

CREATE FUNCTION DBO.CHINA_STR(@S NVARCHAR(100))

RETURNS VARCHAR(100)

AS

BEGIN

WHILE PATINDEX('%[^吖-座]%',@S) > 0

SET @S = STUFF(@S,PATINDEX('%[^吖-座]%',@S),1,N'')

RETURN @S

END

GO

PRINT DBO.CHINA_STR('呵呵ABC123ABC')

GO

--------------------------------------------------------------------

--过滤重复字符

IF OBJECT_ID('DBO.DISTINCT_STR') IS NOT NULL

DROP FUNCTION DBO.DISTINCT_STR

GO

CREATE FUNCTION DBO.DISTINCT_STR(@S NVARCHAR(100),@SPLIT VARCHAR(50))

RETURNS VARCHAR(100)

AS

BEGIN

IF @S IS NULL RETURN(NULL)

DECLARE @NEW VARCHAR(50),@INDEX INT,@TEMP VARCHAR(50)

IF LEFT(@S,1)<>@SPLIT

SET @S = @SPLIT+@S

IF RIGHT(@S,1)<>@SPLIT

SET @S = @S+@SPLIT

WHILE CHARINDEX(@SPLIT,@S)>0 AND LEN(@S)<>1

BEGIN

SET @INDEX = CHARINDEX(@SPLIT,@S)

SET @TEMP = LEFT(@S,CHARINDEX(@SPLIT,@S,@INDEX+LEN(@SPLIT)))

IF @NEW IS NULL

SET @NEW = ISNULL(@NEW,'')+@TEMP

ELSE

SET @NEW = ISNULL(@NEW,'')+REPLACE(@TEMP,@SPLIT,'')+@SPLIT

WHILE CHARINDEX(@TEMP,@S)>0

BEGIN

SET @S=STUFF(@S,CHARINDEX(@TEMP,@S)+LEN(@SPLIT),CHARINDEX(@SPLIT,@S,CHARINDEX(@TEMP,@S)+LEN(@SPLIT))-CHARINDEX(@TEMP,@S),'')

END

END

RETURN RIGHT(LEFT(@NEW,LEN(@NEW)-1),LEN(LEFT(@NEW,LEN(@NEW)-1))-1)

END

GO

PRINT DBO.DISTINCT_STR('A,A,B,C,C,B,C,',',')

--A,B,C

GO

--------------------------------------------------------------------

--过滤重复字符2

IF OBJECT_ID('DBO.DISTINCT_STR2') IS NOT NULL

DROP FUNCTION DBO.DISTINCT_STR2

GO

CREATE FUNCTION DBO.DISTINCT_STR2(@S varchar(8000))

RETURNS VARCHAR(100)

AS

BEGIN

IF @S IS NULL RETURN(NULL)

DECLARE @NEW VARCHAR(50),@INDEX INT,@TEMP VARCHAR(50)

WHILE LEN(@S)>0

BEGIN

SET @NEW=ISNULL(@NEW,'')+LEFT(@S,1)

SET @S=REPLACE(@S,LEFT(@S,1),'')

END

RETURN @NEW

END

GO

SELECT DBO.DISTINCT_STR2('AABCCD')

--ABCD

GO

--------------------------------------------------------------------

IF OBJECT_ID('DBO.SPLIT_STR') IS NOT NULL

DROP FUNCTION DBO.SPLIT_STR

GO

CREATE FUNCTION DBO.SPLIT_STR(

@S varchar(8000), --包含多个数据项的字符串

@INDEX int, --要获取的数据项的位置

@SPLIT varchar(10) --数据分隔符

)

RETURNS VARCHAR(100)

AS

BEGIN

IF @S IS NULL RETURN(NULL)

DECLARE @SPLITLEN int

SELECT @SPLITLEN=LEN(@SPLIT+'A')-2

WHILE @INDEX>1 AND CHARINDEX(@SPLIT,@S+@SPLIT)>0

SELECT @INDEX=@INDEX-1,@S=STUFF(@S,1,CHARINDEX(@SPLIT,@S+@SPLIT)+@SPLITLEN,'')

RETURN(ISNULL(LEFT(@S,CHARINDEX(@SPLIT,@S+@SPLIT)-1),''))

END

GO

PRINT DBO.SPLIT_STR('AA|BB|CC',2,'|')