如何仅使用MySQL更新日期时间字段的日期？

Question

如何仅使用MySQL更新日期时间字段的日期？

10

我有一个如下的表格

| 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 |

我想只更新日期，但不知道从哪里开始。我的意思是在datetime字段date中，我想将日期“2014-01-08”更新为“2014-01-01”。我该怎么做？我尝试过这个。

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'

这里是

Fiddle结构

。

- Muhammad Raheel

4个回答

8

试试这个：

UPDATE calldata
SET date = CONCAT('2014-01-01 ', TIME(date))
WHERE DATE(date) = '2014-01-08'

请查看SQL FIDDLE DEMO

输出结果

| 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 |

- Saharsh Shah

3

UPDATE calldata
SET date = '2014-01-01'
WHERE DATE(date) = '2014-01-08'

SQLFiddle demo

- juergen d

我已经尝试过了，但是它似乎没有更新，我无法理解为什么？ - Muhammad Raheel

确实如此！！@raheelshan - MrYo

0

UPDATE calldata SET date = '2014-01-01' WHERE DATE(date) = '2014-01-01'

和

UPDATE calldata SET date = '2014-01-01' WHERE date = '2014-01-01'

两种情况都可以正常工作，而在我的情况下，日期的类型是datetime。

- Seshidhar G

网页内容由stack overflow 提供, 点击上面的

可以查看英文原文，
原文链接

- Aziz Shaikh · Accepted Answer

一个选择是使用这个：

UPDATE `calldata`
SET `date` = DATE_SUB(`date`, INTERVAL 7 DAY)
WHERE DATE(`date`) = '2014-01-08'

Fiddle：http://sqlfiddle.com/#!2/28d71/1

为了获得更好的性能，请使用以下查询，因为MySQL可以将索引（如果有）用于DATE()不在比较运算符左侧：

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