SQL函數：字符串中提取數字，英文，中文，過濾重復字符?

--提取數字
IF?OBJECT_ID('DBO.GET_NUMBER')?IS?NOT?NULL
DROP?FUNCTION?DBO.GET_NUMBER
GO
CREATE?FUNCTION?DBO.GET_NUMBER(@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
--測試
PRINT?DBO.GET_NUMBER('呵呵ABC-12,3ABC')
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
--測試
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
--------------------------------------------------------------------
--過濾重復字符
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
--------------------------------------------------------------------
--過濾重復字符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),??????--包含多個數據項的字符串
@INDEX?int,?????????????--要獲取的數據項的位置
@SPLIT?varchar(10)?????--數據分隔符
)
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,'|')
--
GO

轉載于:https://www.cnblogs.com/northstar/archive/2011/11/16/2251209.html

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