如何在SQL Server中查詢本日 本周 本月 本季 本年的記錄【轉並改】

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表名為：tableName
時間欄位名為：theDate
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datePart函數

日期部分	縮寫
year	yy, yyyy
quarter	qq, q
month	mm, m
dayofyear	dy, y
day	dd, d
week	wk, ww
weekday	dw
Hour	hh
minute	mi, n
second	ss, s
millisecond	ms

查詢本日的記錄
select * from tableName where DATEPART(dd, theDate) = DATEPART(dd, GETDATE()) and DATEPART(mm, theDate) = DATEPART(mm, GETDATE()) and DATEPART(yy, theDate) = DATEPART(yy, GETDATE())

查詢本周的記錄
select * from tableName where DATEPART(wk, theDate) = DATEPART(wk, GETDATE()) and DATEPART(yy, theDate) = DATEPART(yy, GETDATE())

查詢本月的記錄
select * from tableName where DATEPART(mm, theDate) = DATEPART(mm, GETDATE()) and DATEPART(yy, theDate) = DATEPART(yy, GETDATE())

查詢本季的記錄
select * from tableName where DATEPART(qq, theDate) = DATEPART(qq, GETDATE()) and DATEPART(yy, theDate) = DATEPART(yy, GETDATE())

查詢本年的記錄
select * from tableName where DATEPART(yy, theDate) = DATEPART(yy, GETDATE())

其中:GETDATE()是獲得系統時間的函數。 

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datediff函數

日期部分	縮寫
year	yy, yyyy
quarter	qq, q
Month	mm, m
dayofyear	dy, y
Day	dd, d
Week	wk, ww
Hour	hh
minute	mi, n
second	ss, s
millisecond	ms

查詢本日的記錄
select count(*) from tableName where (DATEDIFF(dd, theDate, GETDATE()) = 0)
查詢本周的記錄
select count(*) from tableName where (DATEDIFF(wk, theDate, GETDATE()) = 0)
查詢本月的記錄
select count(*) from tableName where (DATEDIFF(mm, theDate, GETDATE()) = 0)
查詢本季的記錄
select count(*) from tableName where (DATEDIFF(qq, theDate, GETDATE()) = 0)
查詢本年的記錄
select count(*) from tableName where (DATEDIFF(yy, theDate, GETDATE()) = 0)

原始文章：http://blog.csdn.net/coolwzjcool/archive/2007/08/25/1758470.aspx