日期的一些雜七雜八的東西
---===hubin===---
做這行的什麼東西都要會,各種各樣的數據庫都要知道些.
SQLServer2005
===時間===
The following examples use the six SQL Server system functions
that return current date and time to return the date, time, or both.
The values are returned in series;
therefore, their fractional seconds might be different.
A. Getting the current system date and time
SELECT SYSDATETIME()
,SYSDATETIMEOFFSET()
,SYSUTCDATETIME()
,CURRENT_TIMESTAMP
,GETDATE()
,GETUTCDATE();
Here is the result set.
SYSDATETIME() 2007-04-30 13:10:02.0474381
SYSDATETIMEOFFSET()2007-04-30 13:10:02.0474381 -07:00
SYSUTCDATETIME() 2007-04-30 20:10:02.0474381
CURRENT_TIMESTAMP 2007-04-30 13:10:02.047
GETDATE() 2007-04-30 13:10:02.047
GETUTCDATE() 2007-04-30 20:10:02.047
B. Getting the current system date
SELECT CONVERT (date, SYSDATETIME())
,CONVERT (date, SYSDATETIMEOFFSET())
,CONVERT (date, SYSUTCDATETIME())
,CONVERT (date, CURRENT_TIMESTAMP)
,CONVERT (date, GETDATE())
,CONVERT (date, GETUTCDATE());
Here is the result set.
SYSDATETIME() 2007-05-03
SYSDATETIMEOFFSET() 2007-05-03
SYSUTCDATETIME() 2007-05-04
CURRENT_TIMESTAMP 2007-05-03
GETDATE() 2007-05-03
GETUTCDATE() 2007-05-04
C. Getting the current system time
SELECT CONVERT (time, SYSDATETIME())
,CONVERT (time, SYSDATETIMEOFFSET())
,CONVERT (time, SYSUTCDATETIME())
,CONVERT (time, CURRENT_TIMESTAMP)
,CONVERT (time, GETDATE())
,CONVERT (time, GETUTCDATE());
Here is the result set.
SYSDATETIME() 13:18:45.3490361
SYSDATETIMEOFFSET()13:18:45.3490361
SYSUTCDATETIME() 20:18:45.3490361
CURRENT_TIMESTAMP 13:18:45.3470000
GETDATE() 13:18:45.3470000
GETUTCDATE() 20:18:45.3470000
上面是MSDN上copy來的,
這裏我要加的是
select getDate()-2;
'-2',也沒有說2是什麼,但是結果是今天-2天,就是前天的前天.
會很有用.
MSDN上的地址http://msdn.microsoft.com/en-us/library/aa258266(SQL.80).aspx
現在的日期:2010-10-12_14:05:09
做這行的什麼東西都要會,各種各樣的數據庫都要知道些.
SQLServer2005
===時間===
The following examples use the six SQL Server system functions
that return current date and time to return the date, time, or both.
The values are returned in series;
therefore, their fractional seconds might be different.
A. Getting the current system date and time
SELECT SYSDATETIME()
,SYSDATETIMEOFFSET()
,SYSUTCDATETIME()
,CURRENT_TIMESTAMP
,GETDATE()
,GETUTCDATE();
Here is the result set.
SYSDATETIME() 2007-04-30 13:10:02.0474381
SYSDATETIMEOFFSET()2007-04-30 13:10:02.0474381 -07:00
SYSUTCDATETIME() 2007-04-30 20:10:02.0474381
CURRENT_TIMESTAMP 2007-04-30 13:10:02.047
GETDATE() 2007-04-30 13:10:02.047
GETUTCDATE() 2007-04-30 20:10:02.047
B. Getting the current system date
SELECT CONVERT (date, SYSDATETIME())
,CONVERT (date, SYSDATETIMEOFFSET())
,CONVERT (date, SYSUTCDATETIME())
,CONVERT (date, CURRENT_TIMESTAMP)
,CONVERT (date, GETDATE())
,CONVERT (date, GETUTCDATE());
Here is the result set.
SYSDATETIME() 2007-05-03
SYSDATETIMEOFFSET() 2007-05-03
SYSUTCDATETIME() 2007-05-04
CURRENT_TIMESTAMP 2007-05-03
GETDATE() 2007-05-03
GETUTCDATE() 2007-05-04
C. Getting the current system time
SELECT CONVERT (time, SYSDATETIME())
,CONVERT (time, SYSDATETIMEOFFSET())
,CONVERT (time, SYSUTCDATETIME())
,CONVERT (time, CURRENT_TIMESTAMP)
,CONVERT (time, GETDATE())
,CONVERT (time, GETUTCDATE());
Here is the result set.
SYSDATETIME() 13:18:45.3490361
SYSDATETIMEOFFSET()13:18:45.3490361
SYSUTCDATETIME() 20:18:45.3490361
CURRENT_TIMESTAMP 13:18:45.3470000
GETDATE() 13:18:45.3470000
GETUTCDATE() 20:18:45.3470000
上面是MSDN上copy來的,
這裏我要加的是
select getDate()-2;
'-2',也沒有說2是什麼,但是結果是今天-2天,就是前天的前天.
會很有用.
MSDN上的地址http://msdn.microsoft.com/en-us/library/aa258266(SQL.80).aspx
現在的日期:2010-10-12_14:05:09
發表評論
所有評論
還沒有人評論,想成為第一個評論的人麼? 請在上方評論欄輸入並且點擊發布.