Question

我有一个名为dateRange的表，看起来像这样

|ID|dateStart|  dateEnd|
| 1|14-May-14|16-May-14|
| 1|20-May-14|21-May-14|
| 2|20-May-14|21-May-14|

我想在名为dateListed的表格中将其转换为以下格式

|ID|     date|
| 1|14-May-14|
| 1|15-May-14|
| 1|16-May-14|
| 1|20-May-14|
| 1|21-May-14|
| 2|20-May-14|
| 2|21-May-14|

我已经回顾了以下问题Convert Date Range to Individual Days，但由于数据略有不同，我希望有人可以帮助我吗？

感谢。

Answer 1

如果你有一个日期实用工具表，那么它很容易......

DROP TABLE IF EXISTS my_table;

CREATE TABLE my_table
(ID INT NOT NULL 
,dateStart date NOT NULL
,dateEnd date NOT NULL
,PRIMARY KEY(ID,dateStart)
);

INSERT INTO my_table VALUES
(1,'2014-05-14','2014-05-16'),
(1,'2014-05-20','2014-05-21'),
(2,'2014-05-20','2014-05-21');

SELECT * FROM my_table;
+----+------------+------------+
| ID | dateStart  | dateEnd    |
+----+------------+------------+
|  1 | 2014-05-14 | 2014-05-16 |
|  1 | 2014-05-20 | 2014-05-21 |
|  2 | 2014-05-20 | 2014-05-21 |
+----+------------+------------+

SELECT x.ID
     , c.dt date 
  FROM calendar c 
  JOIN my_table x 
    ON c.dt BETWEEN x.dateStart AND x.dateEnd 
 ORDER  
    BY ID
     , date;
+----+------------+
| ID | date       |
+----+------------+
|  1 | 2014-05-14 |
|  1 | 2014-05-15 |
|  1 | 2014-05-16 |
|  1 | 2014-05-20 |
|  1 | 2014-05-21 |
|  2 | 2014-05-20 |
|  2 | 2014-05-21 |
+----+------------+

将包含日期范围的表转换为日期列表

1 个答案: