如何每2行创建范围

Question

我有下表：

+------------+
|    date    |
+------------+
| 2018-07-01 |
| 2018-09-01 |
| 2018-08-01 |
+------------+

如何查询以获得以下结果？

+------------+------------+
|  min_date  |  max_date  |
+------------+------------+
| 2001-01-01 | 2018-07-01 |
| 2018-07-01 | 2018-08-01 |
| 2018-08-01 | 2018-09-01 |
+------------+------------+

Answer 1

lag()接受三个参数，第三个参数是默认参数，因此您可以这样写：

select lag(date, 1, '2001-01-01' as date) over (order by date) as min_date,
       date as max_date
from t;

Answer 2

类似的东西：

/page/2