sql 自定义百分比转换小数函数代码

–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

—小数转化为百分数函数 GetPercentageString
—涂聚文 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
–测试数据 涂聚文 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 –‘无效数据’
END

–百分数转化为小数函数 GetPercentageNumber
—涂聚文 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 –‘无效数据’
END
RETURN @dec
END
GO
–测试数据 涂聚文 Geovin Du
SELECT [dbo].[GetPercentageNumber] (‘5.23%’)
SELECT [dbo].[GetPercentageNumber] (‘%0.23’)