UNPIVOT mysql 数据到其他表 [英] UNPIVOT mysql data to other table

问题描述

我有以下mysql数据

Hi i have the following mysql data

INSERT INTO `monthly` (`id`, `year`, `stat_id`, `cat_id`, `January`, `February`, `March`, `April`, `May`, `June`, `July`, `August`, `September`, `October`, `November`, `December`) VALUES
(1, '2017', '12', '25', '1', '3', '1', '1', '3', '4', '4', '2', '4', '', '', ''),

我希望它变成这样

INSERT INTO `monthlydata` (`id`, `year`, `monthName`, `stat_id`, `cat_id`, `data`) VALUES
(1, '2017', 'January', '12', '25', '1'),
(2, '2017', 'February', '12', '25', '3'),
(3, '2017', 'March', '12', '25', '1'),
(4, '2017', 'April', '12', '25', '1'),
(5, '2017', 'May', '12', '25', '3'),
(6, '2017', 'June', '12', '25', '4'),
(7, '2017', 'July', '12', '25', '4'),
(8, '2017', 'August', '12', '25', '2'),
(9, '2017', 'September', '12', '25', '4'),
(10, '2017', 'October', '12', '25', ''),
(11, '2017', 'November', '12', '25', ''),
(12, '2017', 'December', '12', '25', ''),

是否有更简单的方法来使用 mysql/php

is there an easier way to do this using mysql/php

推荐答案

您需要UNPIVOT您的数据.MySQL 没有内置函数来执行此操作，因此您需要使用多个查询.

You need to UNPIVOT your data. MySQL doesn't have a built in function to do that so you'll need to use multiple queries.

INSERT INTO `monthlydata` (`id`, `year`, `monthName`, `stat_id`, `cat_id`, `data`) VALUES
SELECT id, year, 'January', stat_id, cat_id, January
    FROM monthly WHERE monthName = 'January'
UNION ALL 
SELECT id, year, 'February', stat_id, cat_id, February
    FROM monthly WHERE monthName = 'February'
UNION ALL 
SELECT id, year, 'March', stat_id, cat_id, March
    FROM monthly WHERE monthName = 'March'
.....

此处的

ID 列可能会导致问题.取决于你如何定义它.如果它是自动生成的，那么您可以将其从 INSERT 中删除并让它自动生成.由于所有月份的行都具有相同的 ID，因此您需要处理这种情况.

ID column here might cause issues. Depending on how you have defined it. If it is auto generated then you can remove it from the INSERT and let it be auto generated. Since you'll have rows for all months with same ID, you need to handle that scenario.

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