sqlserver 計算資料庫時間差

datediff(datepart,startdate,enddate) 返回間隔 datepart 的數
SELECT datediff(yy,’2010-06-1 10:10′,GETDATE()) –計算多少年
SELECT datediff(q,’2011-01-1 10:10′,GETDATE())  –計算多少季度 3 個月一個季度
SELECT datediff(mm,’2011-06-1 10:10′,GETDATE()) –計算多少月
SELECT datediff(dd,’2011-06-1 10:10′,GETDATE()) –計算多少天
SELECT datediff(wk,’2011-06-1 10:10′,GETDATE()) –計算多少周
SELECT datediff(hh,’2011-06-10 10:10′,’2011-06-10 11:10′) –計算多少小時
SELECT datediff(n,’2011-06-10 10:10′,’2011-06-10 10:11′) –計算多少分鐘
SELECT datediff(ss,’2011-06-10 10:10:00′,’2011-06-10 10:10:10′) –計算多少秒
SELECT datediff(ms,’2011-06-16 10:10:10′,’2011-06-16 10:10:11′) –計算多少毫秒