/**//*
CREATE?FUNCTION?dbo.sys_GetQuarterBeginDate(@month?smalldatetime)
RETURNS?smalldatetime

AS

--function?:?返回季度的開始月
BEGIN

DECLARE?@dt?smalldatetime

IF?MONTH(@month)?<?4
??????SET?@dt?=?CONVERT(VARCHAR,YEAR(@month)?)+?'-1-1'
ELSE
BEGIN
??????IF?MONTH(@month)?<?7
?????????SET?@dt?=?CONVERT(VARCHAR,YEAR(@month))+?'-4-1'
??????ELSE
????????BEGIN
IF?MONTH(@month)?<?10
?????SET?@dt?=?CONVERT(VARCHAR,YEAR(@month))?+?'-7-1'
ELSE
?????SET?@dt?=?CONVERT(VARCHAR,YEAR(@month)?)+?'-10-1'
????????END
END

????RETURN?@dt

END
*/

調用：select?dbo.sys_GetQuarterBeginDate('2007-6-28')
===========================================================================================================
/**//*
CREATE?FUNCTION?dbo.sys_GetQuarter(@month?smalldatetime)
RETURNS?int

AS

--function?:?返回某月是第幾季度
BEGIN

DECLARE?@qw?int

SELECT?@qw?=?CASE?MONTH?(@month)
?????WHEN?1????THEN?1
?????WHEN?2????THEN?2
?????WHEN?3????THEN?3
?????WHEN?4????THEN?1
?????WHEN?5????THEN?2
?????WHEN?6????THEN?3
?????WHEN?7????THEN?1
?????WHEN?8????THEN?2
?????WHEN?9????THEN?3
?????WHEN?10?THEN?1
?????WHEN?11?THEN?2
?????WHEN?12?THEN?3
END?
????RETURN?@qw

END
*/

轉載于:https://www.cnblogs.com/jinweida/archive/2008/07/07/1237428.html

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