[英]Fractional Second precision in DBMSs
I would like to know what Fractional Second Precision
is, with some examples. 我想通过一些例子来了解
Fractional Second Precision
。
And how different DBMSs support it? 以及不同的DBMS如何支持它?
sql-server Sql Server 2008 and newer has DATETIME2
which is has precision of 100ns sql-server Sql Server 2008和更新版本的
DATETIME2
精度为100ns
Character length 19 positions minimum (YYYY-MM-DD hh:mm:ss ) to 27 maximum (YYYY-MM-DD hh:mm:ss.0000000)
字符长度最小为19个位置(YYYY-MM-DD hh:mm:ss)至27最大值(YYYY-MM-DD hh:mm:ss.0000000)
Precision, scale 0 to 7 digits, with an accuracy of 100ns.
精度,0到7位数,精度为100ns。 The default precision is 7 digits.
默认精度为7位数。
http://msdn.microsoft.com/en-us/library/bb677335.aspx http://msdn.microsoft.com/en-us/library/bb677335.aspx
mysql - MySQL 5.6.4 mysql - MySQL 5.6.4
MySQL 5.6.4 and up expands fractional seconds support for TIME, DATETIME, and TIMESTAMP values, with up to microseconds (6 digits) precision:
MySQL 5.6.4及更高版本扩展了对TIME,DATETIME和TIMESTAMP值的小数秒支持,精度高达微秒(6位):
http://dev.mysql.com/doc/refman/5.6/en/fractional-seconds.html http://dev.mysql.com/doc/refman/5.6/en/fractional-seconds.html
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