Mysql:交换不同行的数据 [英] Mysql: Swap data for different rows

问题描述

假设表fruits如下所示:

------------------------------------------
| id |    name    |   color   | calories |
------------------------------------------
| 1  | apple      | red       | 20       |
| 2  | orange     | orange    | 10       |
| 3  | grapes     | green     | 5        |
| 4  | bananas    | yellow    | 15       |
| 5  | plum       | purple    | 25       |
------------------------------------------

我如何交换一行的值，而另一行却保持ID号不变?

How can I swap the values of a row, with another, leaving the id number intact?

示例:

SWAP ROW WITH ID "5" WITH ROW WITH ID "2"

结果:

------------------------------------------
| id |    name    |   color   | calories |
------------------------------------------
| 1  | apple      | red       | 20       |
| 2  | plum       | purple    | 25       |
| 3  | grapes     | green     | 5        |
| 4  | bananas    | yellow    | 15       |
| 5  | orange     | orange    | 10       |
------------------------------------------

请注意，除id之外，所有值均完整无缺. 我需要使用非常大的值列表来执行此操作，因此我需要单行代码，或者最多不需要创建临时表之类的东西.

Note that all the values are intact except for the id. I need to do this with a really large list of values, so I need a one-liner, or at most, something that doesn't require the creation of temporary tables, and things like that.

注意:id是唯一的

谢谢

推荐答案

您可以使用连接不等式来排列要交换的行:

You could use a join inequality to line up the rows you want to swap:

update fruit a
 inner join fruit b on a.id <> b.id
   set a.color = b.color,
       a.name = b.name,
       a.calories = b.calories
 where a.id in (2,5) and b.id in (2,5)

http://sqlfiddle.com/#!18/27318a/5

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