问题描述
在 oracle 10g 中执行此 SQL 后:
After executing this SQL in oracle 10g:
SELECT SYSDATE, CURRENT_TIMESTAMP FROM DUAL
我收到这个奇怪的输出:
I receive this strange output:
时间差的原因是什么?服务器时间等于 SYSDATE 值
What is cause of the difference in time? The server time is equal of SYSDATE value
推荐答案
CURRENT_DATE 和 CURRENT_TIMESTAMP 返回会话时区中的当前日期和时间.
CURRENT_DATE and CURRENT_TIMESTAMP return the current date and time in the session time zone.
SYSDATE 和 SYSTIMESTAMP 返回系统日期和时间 - 即数据库所在的系统.
SYSDATE and SYSTIMESTAMP return the system date and time - that is, of the system on which the database resides.
如果您的客户端会话与数据库所在的服务器不在同一个时区(或者说它不是，通过您的 NLS 设置)，混合 SYS* 和 CURRENT_* 函数将返回不同的值.他们都是对的，他们只是代表不同的东西.看起来您的服务器处于(或认为是)+4:00 时区，而您的客户端会话处于 +4:30 时区.
If your client session isn't in the same timezone as the server the database is on (or says it isn't anyway, via your NLS settings), mixing the SYS* and CURRENT_* functions will return different values. They are all correct, they just represent different things. It looks like your server is (or thinks it is) in a +4:00 timezone, while your client session is in a +4:30 timezone.
如果时钟不同步，您可能还会看到时间上的微小差异，这在这里似乎不是问题.
You might also see small differences in the time if the clocks aren't synchronised, which doesn't seem to be an issue here.
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