MSSQL中计算两个日期之间相隔 xx天xx小时xx分xx秒
DECLARE @dt1 AS datetime, @dt2 AS datetime;
SELECT @dt1 = '2008-8-4 9:36:41', @dt2 = '2008-8-2 9:33:39';
DECLARE @Days AS int, @Hours AS int, @Minutes AS int, @Seconds AS int;
SET @Seconds = DATEDIFF( second, @dt2, @dt1);
SET @Days = @Seconds / (24 * 60 * 60)
SET @Seconds = @Seconds - @Days * 24 * 60 * 60
SET @Hours = @Seconds / (60 * 60);
SET @Seconds = @Seconds - @Hours * 60 * 60
SET @Minutes = @Seconds / 60;
SET @Seconds = @Seconds - @Minutes * 60;
SELECT CONVERT(varchar(10), @Days ) + '天'
+ CONVERT(varchar(10), @Hours ) + '小时'
+ CONVERT(varchar(10), @Minutes ) + '分'
+ CONVERT(varchar(10), @Seconds ) + '秒';
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:dosmenu
REM 选择菜单
echo Windows 服务启动或关闭 By hope 2008年2月7日
echo.
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echo [3]启动Oracle9i [4]关闭Oracle9i
echo.
echo ......
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http://www.sqlhacks.com/Administration/Memory-Usage
Memory is one the most important factor affecting MSSQL performance.
As an administrator, you should be monitoring the memory
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Sql2005中使用ow_number() partition进行分组实验,
SQL:
select * from stu
select id,row_number() over (partition by snm order by id) from stu
结果:
id snm
----------------
111 111V
111 111W
222 222N
333 3123
444 3123
555 3123
666 3232
777 3232
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--此代码将本地所有的用户数据库备份到共享目录“\\backupServerIp\ShareName\数据库备份”下。
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sp_configure 'xp_cmdshell',1 ......