sql 自定義百分比轉換小數函數

--CAST 和 CONVERT 函数 Percentage
DECLARE @dec decimal(5,3), @var varchar(10),@hun decimal(5,1)
set @dec=0.025
set @hun=@dec*100
set @var=cast(@hun as varchar(20))+'%'
select @var

---小數轉化為百分數函數 GetPercentageString
---塗聚文 Geovin Du
if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[GetPercentageString]') and xtype in (N'FN', N'IF', N'TF'))
drop function [dbo].[GetPercentageString]
GO
CREATE   function  GetPercentageString
(  
	@dec decimal(10,3)
)
returns varchar(20)
AS
BEGIN
  DECLARE @var varchar(10),@hun decimal(10,1)
        SET @hun=@dec*100
	SET @var=cast(@hun as varchar(20))+'%'
	RETURN @var
END
GO
--測試數據 塗聚文 Geovin Du
SELECT [dbo].[GetPercentageString] (0.05)
SELECT [dbo].[GetPercentageString] (0.25)
SELECT [dbo].[GetPercentageString] (1.25)

--1. 查询字符串中是否包含非数字字符
SELECT PATINDEX('%[^0-9]%', '1235X461')
SELECT PATINDEX('%[^0-9]%', '12350461')
--2. 查询字符串中是否包含数字字符
SELECT PATINDEX('%[0-9]%', 'SUYLLGoO')
SELECT PATINDEX('%[0-9]%', 'SUYLLG0O')


DECLARE @dec decimal(10,4), @var varchar(10),@hun decimal(10,4),@I INT,@K INT,@S VARCHAR(20)
SET @var='5.23%'
--SELECT @K=LEN(@var)
--SELECT @S=LEFT(@var,@K-1)
SELECT @S=RIGHT(@var,1)
--SELECT @S
SELECT @I=CHARINDEX('%',@S)
IF @I>0
   BEGIN
	SET @var=REPLACE(@var,'%','')
	SET @hun=CAST(@var AS decimal(10,4))
	SET @dec=@hun/100
	SELECT @dec
   END
ELSE
   BEGIN
	SELECT @dec=NULL --'無效數據'
   END
   

--百分數轉化為小數函數 GetPercentageNumber
---塗聚文 Geovin Du
if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[GetPercentageNumber]') and xtype in (N'FN', N'IF', N'TF'))
drop function [dbo].[GetPercentageNumber]
GO
CREATE   function  GetPercentageNumber
(  
	@var varchar(10)
)
returns decimal(10,4)
AS
BEGIN
  DECLARE  @dec decimal(10,4), @hun decimal(10,4),@I INT,@K INT,@S VARCHAR(20)
	SELECT @S=RIGHT(@var,1)
	--SELECT @S
	SELECT @I=CHARINDEX('%',@S)
IF @I>0
   BEGIN
	SET @var=REPLACE(@var,'%','')
	SET @hun=CAST(@var AS decimal(10,4))
	SET @dec=@hun/100
	--SELECT @dec
   END
ELSE
   BEGIN
	SELECT @dec=NULL --'無效數據'
   END
RETURN @dec
END
GO
--測試數據 塗聚文 Geovin Du
SELECT [dbo].[GetPercentageNumber] ('5.23%')

SELECT [dbo].[GetPercentageNumber] ('%0.23')