..: 放松不放縱 :..

CREATE FUNCTION dbo.FormatDateTime?
(?
? ? @dt DATETIME,?
? ? @format VARCHAR(16)?
)?
RETURNS VARCHAR(64)?
AS?
BEGIN?
? ? DECLARE @dtVC VARCHAR(64)?
? ? SELECT @dtVC = CASE @format?
??? WHEN 'LONGDATE' THEN?
??????? DATENAME(dw, @dt)?
? ? ? ? + ',' + SPACE(1) + DATENAME(m, @dt)?
? ? ? ? + SPACE(1) + CAST(DAY(@dt) AS VARCHAR(2))?
? ? ? ? + ',' + SPACE(1) + CAST(YEAR(@dt) AS CHAR(4))?
??? WHEN 'LONGDATEANDTIME' THEN?
??????? DATENAME(dw, @dt)?
? ? ? ? + ',' + SPACE(1) + DATENAME(m, @dt)?
? ? ? ? + SPACE(1) + CAST(DAY(@dt) AS VARCHAR(2))?
? ? ? ? + ',' + SPACE(1) + CAST(YEAR(@dt) AS CHAR(4))?
? ? ? ? + SPACE(1) + RIGHT(CONVERT(CHAR(20),?
? ? ? ? @dt - CONVERT(DATETIME, CONVERT(CHAR(8),?
? ? ? ? @dt, 112)), 22), 11)?
??? WHEN 'SHORTDATE' THEN?
??????? LEFT(CONVERT(CHAR(19), @dt, 0), 11)?
??? WHEN 'SHORTDATEANDTIME' THEN?
??????? REPLACE(REPLACE(CONVERT(CHAR(19), @dt, 0),'AM', ' AM'), 'PM', ' PM')?
??? WHEN 'UNIXTIMESTAMP' THEN?
??????? CAST(DATEDIFF(SECOND, '19700101', @dt)?AS VARCHAR(64))?
??? WHEN 'YYYYMMDD' THEN?
??????? CONVERT(CHAR(8), @dt, 112)?
??? WHEN 'YYYY-MM-DD' THEN?
??????? CONVERT(CHAR(10), @dt, 23)?
??? WHEN 'YYMMDD' THEN?
??????? CONVERT(VARCHAR(8), @dt, 12)?
??? WHEN 'YY-MM-DD' THEN?
??????? STUFF(STUFF(CONVERT(VARCHAR(8), @dt, 12),?5, 0, '-'), 3, 0, '-')?
??? WHEN 'MMDDYY' THEN?
??????? REPLACE(CONVERT(CHAR(8), @dt, 10), '-', SPACE(0))?
??? WHEN 'MM-DD-YY' THEN?
??????? CONVERT(CHAR(8), @dt, 10)?
??? WHEN 'MM/DD/YY' THEN?
??????? CONVERT(CHAR(8), @dt, 1)?
??? WHEN 'MM/DD/YYYY' THEN?
??????? CONVERT(CHAR(10), @dt, 101)?
??? WHEN 'DDMMYY' THEN?
??????? REPLACE(CONVERT(CHAR(8), @dt, 3), '/', SPACE(0))?
??? WHEN 'DD-MM-YY' THEN?
??????? REPLACE(CONVERT(CHAR(8), @dt, 3), '/', '-')?
??? WHEN 'DD/MM/YY' THEN?
??????? CONVERT(CHAR(8), @dt, 3)?
??? WHEN 'DD/MM/YYYY' THEN?
??????? CONVERT(CHAR(10), @dt, 103)?
??? WHEN 'HH:MM:SS 24' THEN?
??????? CONVERT(CHAR(8), @dt, 8)?
??? WHEN 'HH:MM 24' THEN?
??????? LEFT(CONVERT(VARCHAR(8), @dt, 8), 5)?
??? WHEN 'HH:MM:SS 12' THEN?
??????? LTRIM(RIGHT(CONVERT(VARCHAR(20), @dt, 22), 11))?
??? WHEN 'HH:MM 12' THEN?
??????? LTRIM(SUBSTRING(CONVERT(?
? ? ? ? VARCHAR(20), @dt, 22), 10, 5)?
? ? ? ? + RIGHT(CONVERT(VARCHAR(20), @dt, 22), 3))?
??? ELSE?
??????? 'Invalid format specified'?
??? END?
? ? RETURN @dtVC?
END?
GO
====================================================================================
====================================================================================
DECLARE @now DATETIME?
SET @now = GETDATE()?
?
PRINT dbo.FormatDateTime(@now, 'LONGDATE')?
PRINT dbo.FormatDateTime(@now, 'LONGDATEANDTIME')?
PRINT dbo.FormatDateTime(@now, 'SHORTDATE')?
PRINT dbo.FormatDateTime(@now, 'SHORTDATEANDTIME')?
PRINT dbo.FormatDateTime(@now, 'UNIXTIMESTAMP')?
PRINT dbo.FormatDateTime(@now, 'YYYYMMDD')?
PRINT dbo.FormatDateTime(@now, 'YYYY-MM-DD')?
PRINT dbo.FormatDateTime(@now, 'YYMMDD')?
PRINT dbo.FormatDateTime(@now, 'YY-MM-DD')?
PRINT dbo.FormatDateTime(@now, 'MMDDYY')?
PRINT dbo.FormatDateTime(@now, 'MM-DD-YY')?
PRINT dbo.FormatDateTime(@now, 'MM/DD/YY')?
PRINT dbo.FormatDateTime(@now, 'MM/DD/YYYY')?
PRINT dbo.FormatDateTime(@now, 'DDMMYY')?
PRINT dbo.FormatDateTime(@now, 'DD-MM-YY')?
PRINT dbo.FormatDateTime(@now, 'DD/MM/YY')?
PRINT dbo.FormatDateTime(@now, 'DD/MM/YYYY')?
PRINT dbo.FormatDateTime(@now, 'HH:MM:SS 24')?
PRINT dbo.FormatDateTime(@now, 'HH:MM 24')?
PRINT dbo.FormatDateTime(@now, 'HH:MM:SS 12')?
PRINT dbo.FormatDateTime(@now, 'HH:MM 12')?
PRINT dbo.FormatDateTime(@now, 'goofy')

(((*****)))
http://sqlserver2000.databases.aspfaq.com/can-i-make-sql-server-format-dates-and-times-for-me.html

對一批編號為1~100全部開關朝上（開）的燈進行以下操作：凡是1的倍數反方向撥一次開關；2的倍數反方向又撥一次開關；3的倍數反方向又撥一次開關.........
問：最后為關熄狀態的燈的編號。