在 sqlplus/Oracle 中将纪元转换为日期

2021-12-06 00:00:00 datetime date epoch oracle sqlplus

我有下表:

SQL> desc recording
 Name                 Null?    Type
 -------------------- -------- ------
 CAPTUREID            NOT NULL NUMBER(9)
 STARTDATE            NOT NULL DATE
 ENDDATE                       DATE
 STATE                         NUMBER(1)
 ESTIMATEDENDTIME              NUMBER(13)

这是该表的一行:

SQL> select * from recording where CAPTUREID=14760457;

 CAPTUREID STARTDATE           ENDDATE             STATE ESTIMATEDENDTIME
---------- ------------------- ------------------- ----- ----------------
  14760457 29/09/2010 08:50:01 29/09/2010 09:52:04     0    1285746720000

我很确定这之前已经被问过很多次了,但是到目前为止我发现的所有解决方案都没有真正起作用,所以......我如何转换 ESTIMATEDENDTIME在 SQLPLUS 中的单个查询中从其原始时代形式转换为 DD/MM/YYY HH:MI:SS 格式?

I'm pretty sure that this has been asked so many times before, but all the solutions I've found so far didn't really work, so... How do I convert ESTIMATEDENDTIME from its original epoch form to a DD/MM/YYY HH:MI:SS format in a single query in SQLPLUS?

谢谢!

推荐答案

在 Oracle 中,将 X 添加到 DATE 将在 X 天后返回 DATE.

In Oracle, adding X to a DATE will return you a DATE X days later.

如果 ESTIMATEDENDTIME 是自 Epoch 以来的毫秒数,那么您可以这样做

If ESTIMATEDENDTIME is milliseconds since Epoch then you could do

DATE '1970-01-01' + ( 1 / 24 / 60 / 60 / 1000) * ESTIMATEDENDTIME

然后使用to_char来实现结果日期的正确格式.例如:

and then use to_char to achieve the correct format of the resulting date. e.g:

SELECT 
  captureid
, startdate
, enddate
, state
, estimatedendtime
, DATE '1970-01-01' + ( 1 / 24 / 60 / 60 / 1000) * estimatedendtime AS estimatedenddate
FROM recording

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