如何通过查询从MySql表中获取ein矩阵

Question

我使用的mySql表如下所示：

ID   mondend  |MondStart |TuesEnd   |TuesStrt  |wedsEnd  |wednStrt  
120| 06:00:00 | 22:00:00 |06:00:00  |22:00:00  |06:00:00    |22:00:00       
122| 06:00:00 | 22:00:00 |06:00:00  |22:00:00  |06:00:00    |22:00:00 

是否有可能通过查询使表格看起来像这样？：

120| monday     |   22:00:00 |06:00:00  |   
   | tuesday    |   22:00:00 |06:00:00  |
   | tuesday    |   22:00:00 |06:00:00  |

122|monday      |   22:00:00 |06:00:00  |   
   | tuesday    |   22:00:00 |06:00:00  |
   | tuesday    |   22:00:00 |06:00:00  |

Answer 1

一种解决方案是使用UNION ALL查询：

SELECT ID, 'monday' AS week_day, MondStart AS day_start, TuesEnd day_end
FROM tablename
UNION ALL
SELECT ID, 'tuesday' AS week_day, TuesStrt AS day_start, WedEnd day_end
FROM tablename
UNION ALL
...etc...

如果你想要一个表而不是一个查询，你可以使用：

CREATE TABLE final_table AS
...the select query above...