leetcode原文引用：
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Given a Weather table, write a SQL query to find all dates' Ids with higher temperature compared to its previous (yesterday's) dates.
+---------+------------+------------------+
| Id(INT) | Date(DATE) | Temperature(INT) |
+---------+------------+------------------+
| 1 | 2015-01-01 | 10 |
| 2 | 2015-01-02 | 25 |
| 3 | 2015-01-03 | 20 |
| 4 | 2015-01-04 | 30 |
+---------+------------+------------------+
For example, return the following Ids for the above Weather table:
+----+
| Id |
+----+
| 2 |
| 4 |
+----+
我的sql语句如下：
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select t2.id from Weather t1
inner join Weather t2 on
t1.Temperature < t2.temperature
and
to_days(t1.Date) = to_days(t2.Date)-1
注意：原来忘了使用to_days函数，导致提交一直说有错误，必须要加上to_days函数！！