There is a text filed in a table called as description. I would like to extract two date fields from this string when there is an occurrence of '~' character using sql server 2005 stored procedure. Help me out in this case.
Example: string: '长期租金;10/1/2012 ~ 10/31/2012'. At occurrence of ~ operator I would like to have from-date: 20121001 and to-date:20121031.
In this instance you can use the following but really you need an exists clause or something like that to test the string for the tilde (~) and as everyone else has stated, this only works if the string always has a semicolon(;) and a tilde(~). You can convert to the strings into datetime fields if you need. I have placed the string in a variable to make it easier to read...
DECLARE @string AS NVARCHAR(255)
SET @string = '长期租金;10/1/2012 ~ 10/31/2012'
SELECT StartDate = SUBSTRING(@string,CHARINDEX(';',@string)+1,LEN(@string)-CHARINDEX('~',@string)-1) ,EndDate = LTRIM(RIGHT(@string,LEN(@string)-CHARINDEX('~',@string)))
Here is a method which will give the start and end dates. I left most of the testing selects in place but commented out.
DECLARE @string AS NVARCHAR(255)
DECLARE @Seperator as char(1) = '~'
declare @CharStartDate as varchar(10)
declare @CharStopDate as varchar(10)
declare @StartDate as date
declare @StopDate as date
declare @I int
--SET @string = 'xvvvvvvcc;1/09/2012 ~ 1/10/2012xx'
--SET @string = 'xvvvvvvcc;12/31/2012 ~ 1/1/2012xx'
--SET @string = 'xvvvvvvcc;12/1/2012 ~ 10/0/2012xx'
SET @string = 'xvvvvvvcc;1/2/2012 ~ 1/3/2012xx'
--longest date 12/31/2011 = 10
--shortest date 1/1/2012 = 8
-- width of seperator = 3
SELECT
@CharStartDate = substring (@string, CHARINDEX(@Seperator,@string)-11,10)
,@CharStopDate = substring (@string, CHARINDEX(@Seperator,@string)+2,10)
--SELECT @CharStartDate,@CharStopDate
select @I = ascii(substring(@CharStartDate,1,1))
While @I > 57
BEGIN
set @CharStartDate = substring(@CharStartDate,2,10)
--select @CharStartDate
select @I = ascii(substring(@CharStartDate,1,1))
END
select @I = ascii(substring(REVERSE(@CharStopDate),1,1))
While @I > 57
BEGIN
set @CharStopDate = REVERSE(substring(REVERSE(@CharStopDate),2,10))
--select @CharStopDate
select @I = ascii(substring(REVERSE(@CharStopDate),1,1))
END
--select ascii(';'),ascii('9'),ascii('8'),ascii('7'),ascii('6'),ascii('6'),ascii('4'),ascii('3'),ascii('2'),ascii('1'),ascii('0')
SELECT @StartDate = @CharStartDate,@StopDate = @CharStopDate
--SELECT @I,@string,@Seperator,@CharStartDate,@CharStopDate,@StartDate,@StopDate
select datediff(dd,@StartDate,@StopDate) AS 'DateDiff',@StartDate as 'Start Date',@StopDate as 'Stop Date'
I will leave it to you to check for the seperator.
CREATE FUNCTION [dbo].[RemoveAlphaCharacters](@Temp nvarchar(max))
RETURNS nvarchar(max)
AS
BEGIN
WHILE PatIndex ('%[^0-9~/]%', @Temp) > 0
SET @Temp = Stuff(@Temp, PatIndex('%[^0-9~/]%', @Temp), 1, '')
RETURN @Temp
END
DECLARE @string nvarchar(max) = '长期租金;10/1/2012 ~ 10/31/2012'
SELECT CONVERT(date, SUBSTRING([dbo].[RemoveAlphaCharacters](@string), 0,
CHARINDEX('~', [dbo].[RemoveAlphaCharacters](@string))), 101) AS BDate,
CONVERT(date, SUBSTRING([dbo].[RemoveAlphaCharacters](@string),
CHARINDEX('~', [dbo].[RemoveAlphaCharacters](@string)) + 1,
CHARINDEX('~', REVERSE([dbo].[RemoveAlphaCharacters](@string)))), 101) AS EDate
i have never used the older version of SQL cause i just graduated but doesnt it have the EXTRACT() function?.. The syntax goes like this below.
SELECT First_Name ,
EXTRACT ( CAST(Created_date AS DATE) FROM Created_date ) AS Date_only ;
You specify 'First_name' to let SQL know you want it as a column and 'created_date' is the field from which youre trying to separate the date. the cast function converts your field to DATE value before extractig it.
i hope this helps . thank you. if im wrong please let me know i would like to improve myself.
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