如何仅从 TIMESTAMP(6) mysql 恢复日期时间和时间？
[英]how recovery ONLY datetime and TIME from TIMESTAMP(6) mysql?
问题描述
I have this database:
我有这个数据库：
CREATE TABLE `pruebas` (
`id` mediumint(8) UNSIGNED NOT NULL,
`datetime` datetime(6) NOT NULL,
`timestamp` timestamp(6) NOT NULL DEFAULT CURRENT_TIMESTAMP(6),
`time` time(6) NOT NULL
) ENGINE=MyISAM DEFAULT CHARSET=utf8;
INSERT INTO `pruebas` (`id`, `datetime`, `timestamp`, `time`) VALUES
(1, '2020-10-27 15:27:30.039951', '2020-10-27 20:27:30.039951', '15:27:30.039951'),
(2, '2020-10-27 15:27:31.162827', '2020-10-27 20:27:31.162827', '15:27:31.162827'),
(3, '2020-10-27 15:28:20.158641', '2020-10-27 20:28:20.158641', '15:28:20.158641'),
(4, '2020-10-27 15:32:17.708642', '2020-10-27 20:32:17.708642', '15:32:17.708642'),
(5, '2020-10-27 15:32:25.938338', '2020-10-27 20:32:25.938338', '15:32:25.938338'),
(6, '2020-10-27 15:32:42.150837', '2020-10-27 20:32:42.150837', '15:32:42.150837'),
(7, '2020-10-27 15:32:50.849249', '2020-10-27 20:32:50.849249', '15:32:50.849249'),
(8, '2020-10-27 15:34:57.296413', '2020-10-27 20:34:57.296413', '15:34:57.296413'),
(9, '2020-10-27 15:35:21.746913', '2020-10-27 20:35:21.746913', '15:35:21.746913'),
(10, '2020-10-27 15:35:36.356490', '2020-10-27 20:35:36.356490', '15:35:36.356490'),
(11, '2020-10-27 15:37:50.815179', '2020-10-27 20:37:50.815179', '15:37:50.815179'),
(12, '2020-10-27 15:39:13.878842', '2020-10-27 20:39:13.878842', '15:39:13.878842'),
(13, '2020-10-27 15:39:24.146655', '2020-10-27 20:39:24.146655', '15:39:24.146655'),
(14, '2020-10-27 15:39:51.128294', '2020-10-27 20:39:51.128294', '15:39:51.128294');
ALTER TABLE `pruebas`
ADD UNIQUE KEY `id` (`id`);
ALTER TABLE `pruebas`
MODIFY `id` mediumint(8) UNSIGNED NOT NULL AUTO_INCREMENT, AUTO_INCREMENT=22;
COMMIT;
how I can recovery ONLY DATETIME from any of this columns?如何从任何此列中恢复 ONLY DATETIME？
I try with DATE_FORMAT, FROM_UNIXTIME, UNIX_TIMESTAMP, TRUNCATE, SEC_TO_TIME, and others "tricks/functions", but never I get: datetime :我尝试使用 DATE_FORMAT、FROM_UNIXTIME、UNIX_TIMESTAMP、TRUNCATE、SEC_TO_TIME 和其他“技巧/功能”，但我从来没有得到： datetime ：
by example from ID 1 I need the result datetime = "2020-10-27 15:27:30", time = 15:27:30以 ID 1 为例，我需要结果 datetime = "2020-10-27 15:27:30", time = 15:27:30
Thanks谢谢
1 个解决方案
解决方案1
1 已采纳 2020-10-27 21:03:33
You can cast() :你可以cast() ：
select cast('2020-10-27 15:27:30.039951' as datetime) dt
For your sample data, this query:对于您的示例数据，此查询：
select p.*,
cast(`datetime` as datetime) datetime1,
cast(`timestamp` as datetime) timestamp1,
cast(`time` as datetime) time1
from pruebas p
Produces:产生：
id | datetime | timestamp | time | datetime1 | timestamp1 | time1 -: | :------------------------- | :------------------------- | :-------------- | :------------------ | :------------------ | :------------------ 1 | 2020-10-27 15:27:30.039951 | 2020-10-27 20:27:30.039951 | 15:27:30.039951 | 2020-10-27 15:27:30 | 2020-10-27 20:27:30 | 2020-10-27 15:27:30 2 | 2020-10-27 15:27:31.162827 | 2020-10-27 20:27:31.162827 | 15:27:31.162827 | 2020-10-27 15:27:31 | 2020-10-27 20:27:31 | 2020-10-27 15:27:31 3 | 2020-10-27 15:28:20.158641 | 2020-10-27 20:28:20.158641 | 15:28:20.158641 | 2020-10-27 15:28:20 | 2020-10-27 20:28:20 | 2020-10-27 15:28:20 4 | 2020-10-27 15:32:17.708642 | 2020-10-27 20:32:17.708642 | 15:32:17.708642 | 2020-10-27 15:32:18 | 2020-10-27 20:32:18 | 2020-10-27 15:32:18 5 | 2020-10-27 15:32:25.938338 | 2020-10-27 20:32:25.938338 | 15:32:25.938338 | 2020-10-27 15:32:26 | 2020-10-27 20:32:26 | 2020-10-27 15:32:26 6 | 2020-10-27 15:32:42.150837 | 2020-10-27 20:32:42.150837 | 15:32:42.150837 | 2020-10-27 15:32:42 | 2020-10-27 20:32:42 | 2020-10-27 15:32:42 7 | 2020-10-27 15:32:50.849249 | 2020-10-27 20:32:50.849249 | 15:32:50.849249 | 2020-10-27 15:32:51 | 2020-10-27 20:32:51 | 2020-10-27 15:32:51 8 | 2020-10-27 15:34:57.296413 | 2020-10-27 20:34:57.296413 | 15:34:57.296413 | 2020-10-27 15:34:57 | 2020-10-27 20:34:57 | 2020-10-27 15:34:57 9 | 2020-10-27 15:35:21.746913 | 2020-10-27 20:35:21.746913 | 15:35:21.746913 | 2020-10-27 15:35:22 | 2020-10-27 20:35:22 | 2020-10-27 15:35:22 10 | 2020-10-27 15:35:36.356490 | 2020-10-27 20:35:36.356490 | 15:35:36.356490 | 2020-10-27 15:35:36 | 2020-10-27 20:35:36 | 2020-10-27 15:35:36 11 | 2020-10-27 15:37:50.815179 | 2020-10-27 20:37:50.815179 | 15:37:50.815179 | 2020-10-27 15:37:51 | 2020-10-27 20:37:51 | 2020-10-27 15:37:51 12 | 2020-10-27 15:39:13.878842 | 2020-10-27 20:39:13.878842 | 15:39:13.878842 | 2020-10-27 15:39:14 | 2020-10-27 20:39:14 | 2020-10-27 15:39:14 13 | 2020-10-27 15:39:24.146655 | 2020-10-27 20:39:24.146655 | 15:39:24.146655 | 2020-10-27 15:39:24 | 2020-10-27 20:39:24 | 2020-10-27 15:39:24 14 | 2020-10-27 15:39:51.128294 | 2020-10-27 20:39:51.128294 | 15:39:51.128294 | 2020-10-27 15:39:51 | 2020-10-27 20:39:51 | 2020-10-27 15:39:51
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