sqlserver 关于日期函数

CONVERT(VARCHAR(24),GETDATE(),23)  -- yyyy-MM-dd

DATEDIFF(datepart,startdate,enddate)

SELECT DATEDIFF(day,'2015-12-30','2015-12-29') AS DiffDate   -- -1
SELECT DATEDIFF(week,'2015-12-01','2015-12-29') AS DiffDate  -- 4
SELECT DATEDIFF(month,'2015-11-01','2015-12-29') AS DiffDate -- 1

DATEADD(datepart,number,date)

SELECT DATEADD(DAY,2,GETDATE()) --后天

datepart 缩写
年	yy, yyyy
季度	qq, q
月	mm, m
年中的日	dy, y
日	dd, d
周	wk, ww
星期	dw, w
小时	hh
分钟	mi, n
秒	ss, s
毫秒	ms
微妙	mcs
纳秒	ns

--昨天
Select * From TableName Where DateDiff(dd, DateTimCol, GetDate()) = 1
--明天
Select * From TableName Where DateDiff(dd, GetDate(), DateTimCol) = 1
--最近七天
Select * From TableName Where DateDiff(dd, DateTimCol, GetDate()) <= 7
--随后七天
Select * From TableName Where DateDiff(dd, GetDate(), DateTimCol) <= 7
--上周
Select * From TableName Where DateDiff(wk, DateTimCol, GetDate()) = 1
--本周
Select * From TableName Where DateDiff(wk, DateTimCol, GetDate()) = 0
--下周
Select * From TableName Where DateDiff(wk, GetDate(), DateTimCol ) = 1
--上月
Select * From TableName Where DateDiff(mm, DateTimCol, GetDate()) = 1
--本月
Select * From TableName Where DateDiff(mm, DateTimCol, GetDate()) = 0
--下月
Select * From TableName Where DateDiff(mm, GetDate(), DateTimCol ) = 1