如何仅使用 mysql 更新日期时间字段的日期
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/21016662/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
提示：将鼠标放在中文语句上可以显示对应的英文。显示中英文
时间：2020-08-31 19:47:47 来源:igfitidea点击:
How can i update date of datetime field with mysql only
提问by Muhammad Raheel
I have a table like this
我有一张这样的桌子
| ID | DATE | DURATION | STATUS | DUPLICATION |
|----|------------------- -------|----------|------------|-------------|
| 1 | January, 08 2014 19:30:12 | 00:00:03 | Aborted | (null) |
| 2 | January, 08 2014 19:30:12 | 00:00:06 | Dropped | (null) |
| 3 | January, 08 2014 05:25:11 | 00:00:20 | Connected | Multiple |
| 4 | January, 08 2014 05:19:21 | 00:00:21 | Connected | Repeat |
| 5 | January, 08 2014 05:12:56 | 00:00:20 | Connected | Unique |
| 6 | January, 08 2014 04:46:56 | 00:00:41 | Unanswered | Multiple |
| 7 | January, 08 2014 04:42:56 | 00:00:35 | Unanswered | Repeat |
| 8 | January, 08 2014 04:34:56 | 00:00:31 | Unanswered | Unique |
| 9 | January, 09 2014 12:06:32 | 00:00:06 | Dropped | (null) |
| 10 | January, 09 2014 12:06:32 | 00:00:03 | Aborted | (null) |
| 11 | January, 09 2014 05:25:11 | 00:00:20 | Connected | Multiple |
| 12 | January, 09 2014 05:19:21 | 00:00:21 | Connected | Repeat |
| 13 | January, 09 2014 05:12:56 | 00:00:20 | Connected | Unique |
| 14 | January, 09 2014 04:46:56 | 00:00:41 | Unanswered | Multiple |
| 15 | January, 09 2014 04:42:56 | 00:00:35 | Unanswered | Repeat |
| 16 | January, 09 2014 04:34:56 | 00:00:31 | Unanswered | Unique |
| 17 | January, 09 2014 12:19:01 | 00:00:20 | Aborted | (null) |
| 18 | January, 09 2014 12:19:01 | 00:00:19 | Connected | Repeat |
| 19 | January, 09 2014 12:15:30 | 00:00:20 | Aborted | (null) |
| 20 | January, 09 2014 12:15:30 | 00:00:19 | Connected | Unique |
| 21 | January, 09 2014 07:25:11 | 00:00:41 | Connected | Multiple |
| 22 | January, 09 2014 07:19:21 | 00:00:27 | Connected | Repeat |
| 23 | January, 09 2014 07:12:56 | 00:00:20 | Connected | Unique |
| 24 | January, 09 2014 06:46:56 | 00:00:32 | Unanswered | Unique |
| 25 | January, 09 2014 06:42:56 | 00:00:29 | Aborted | (null) |
| 26 | January, 09 2014 06:34:56 | 00:00:27 | Aborted | (null) |
| 27 | January, 09 2014 05:34:56 | 00:00:27 | Aborted | (null) |
| 28 | January, 09 2014 05:25:11 | 00:00:41 | Connected | Multiple |
| 29 | January, 09 2014 05:19:21 | 00:00:27 | Connected | Repeat |
| 30 | January, 09 2014 05:12:56 | 00:00:20 | Connected | Unique |
I want to update only the date but dont know where to start from. I mean in the datetime field datei want to update the date '2014-01-08' to '2014-01-01'. How can i do that?
I have tried this.
我只想更新日期但不知道从哪里开始。我的意思是在日期时间字段中，date我想将日期“2014-01-08”更新为“2014-01-01”。我怎样才能做到这一点？我试过这个。
UPDATE calldate cd
INNER JOIN calldate cdl ON cdl.id = cd.id
SET cd.date = ''/*Dont know what to do here */
WHERE DATE(cd.date) = '2014-01-08'
Fiddle Structure
小提琴结构
回答by Aziz Shaikh
One option is to use this:
一种选择是使用这个：
UPDATE `calldata`
SET `date` = DATE_SUB(`date`, INTERVAL 7 DAY)
WHERE DATE(`date`) = '2014-01-08'
Fiddle: http://sqlfiddle.com/#!2/28d71/1
小提琴：http://sqlfiddle.com/#!2/28d71/1
For better performance use the following query because index (if any) can be used by MySQL as DATE()is not on the left side of comparison operator:
为了获得更好的性能，请使用以下查询，因为 MySQL 可以使用索引（如果有），因为DATE()它不在比较运算符的左侧：
UPDATE `calldata`
SET `date` = DATE_SUB(`date`, INTERVAL 7 DAY)
WHERE `date` >= '2014-01-08'
AND `date` < '2014-01-09
Fiddle: http://sqlfiddle.com/#!2/7e7b2/1
小提琴：http://sqlfiddle.com/#!2/7e7b2/1
回答by Saharsh Shah
Try this:
尝试这个：
UPDATE calldata
SET date = CONCAT('2014-01-01 ', TIME(date))
WHERE DATE(date) = '2014-01-08'
Check the SQL FIDDLE DEMO
OUTPUT
输出
| ID | DATE | DURATION | STATUS | DUPLICATION |
|----|--------------------------------|--------------------------------|------------|-------------|
| 1 | January, 01 2014 19:30:12+0000 | January, 01 1970 00:00:03+0000 | Aborted | (null) |
| 2 | January, 01 2014 19:30:12+0000 | January, 01 1970 00:00:06+0000 | Dropped | (null) |
| 3 | January, 01 2014 05:25:11+0000 | January, 01 1970 00:00:20+0000 | Connected | Multiple |
| 4 | January, 01 2014 05:19:21+0000 | January, 01 1970 00:00:21+0000 | Connected | Repeat |
| 5 | January, 01 2014 05:12:56+0000 | January, 01 1970 00:00:20+0000 | Connected | Unique |
| 6 | January, 01 2014 04:46:56+0000 | January, 01 1970 00:00:41+0000 | Unanswered | Multiple |
| 7 | January, 01 2014 04:42:56+0000 | January, 01 1970 00:00:35+0000 | Unanswered | Repeat |
| 8 | January, 01 2014 04:34:56+0000 | January, 01 1970 00:00:31+0000 | Unanswered | Unique |
| 9 | January, 09 2014 12:06:32+0000 | January, 01 1970 00:00:06+0000 | Dropped | (null) |
| 10 | January, 09 2014 12:06:32+0000 | January, 01 1970 00:00:03+0000 | Aborted | (null) |
| 11 | January, 09 2014 05:25:11+0000 | January, 01 1970 00:00:20+0000 | Connected | Multiple |
| 12 | January, 09 2014 05:19:21+0000 | January, 01 1970 00:00:21+0000 | Connected | Repeat |
| 13 | January, 09 2014 05:12:56+0000 | January, 01 1970 00:00:20+0000 | Connected | Unique |
| 14 | January, 09 2014 04:46:56+0000 | January, 01 1970 00:00:41+0000 | Unanswered | Multiple |
| 15 | January, 09 2014 04:42:56+0000 | January, 01 1970 00:00:35+0000 | Unanswered | Repeat |
| 16 | January, 09 2014 04:34:56+0000 | January, 01 1970 00:00:31+0000 | Unanswered | Unique |
| 17 | January, 09 2014 12:19:01+0000 | January, 01 1970 00:00:20+0000 | Aborted | (null) |
| 18 | January, 09 2014 12:19:01+0000 | January, 01 1970 00:00:19+0000 | Connected | Repeat |
| 19 | January, 09 2014 12:15:30+0000 | January, 01 1970 00:00:20+0000 | Aborted | (null) |
| 20 | January, 09 2014 12:15:30+0000 | January, 01 1970 00:00:19+0000 | Connected | Unique |
| 21 | January, 09 2014 07:25:11+0000 | January, 01 1970 00:00:41+0000 | Connected | Multiple |
| 22 | January, 09 2014 07:19:21+0000 | January, 01 1970 00:00:27+0000 | Connected | Repeat |
| 23 | January, 09 2014 07:12:56+0000 | January, 01 1970 00:00:20+0000 | Connected | Unique |
| 24 | January, 09 2014 06:46:56+0000 | January, 01 1970 00:00:32+0000 | Unanswered | Unique |
| 25 | January, 09 2014 06:42:56+0000 | January, 01 1970 00:00:29+0000 | Aborted | (null) |
| 26 | January, 09 2014 06:34:56+0000 | January, 01 1970 00:00:27+0000 | Aborted | (null) |
| 27 | January, 09 2014 05:34:56+0000 | January, 01 1970 00:00:27+0000 | Aborted | (null) |
| 28 | January, 09 2014 05:25:11+0000 | January, 01 1970 00:00:41+0000 | Connected | Multiple |
| 29 | January, 09 2014 05:19:21+0000 | January, 01 1970 00:00:27+0000 | Connected | Repeat |
| 30 | January, 09 2014 05:12:56+0000 | January, 01 1970 00:00:20+0000 | Connected | Unique |
回答by juergen d
回答by Seshidhar G
UPDATE calldata SET date = '2014-01-01' WHERE DATE(date) = '2014-01-01'
and
和
UPDATE calldata SET date = '2014-01-01' WHERE date = '2014-01-01'
two cases will work without any issue and in my case date is of type datetime.
两种情况都可以正常工作，在我的情况下，日期是日期时间类型。
