LeetCode数据库题——197. 上升的温度

给定一个 Weather 表，编写一个 SQL 查询，来查找与之前（昨天的）日期相比温度更高的所有日期的 Id。

+---------+------------------+------------------+
| Id(INT) | RecordDate(DATE) | Temperature(INT) |
+---------+------------------+------------------+
|       1 |       2015-01-01 |               10 |
|       2 |       2015-01-02 |               25 |
|       3 |       2015-01-03 |               20 |
|       4 |       2015-01-04 |               30 |
+---------+------------------+------------------+

例如，根据上述给定的 Weather 表格，返回如下 Id:

+----+
| Id |
+----+
|  2 |
|  4 |
+----+

解决一：

select b.Id from Weather a ,Weather b 
where datediff(b.RecordDate,a.RecordDate)=1 and a.Temperature < b.Temperature

解决二：

select b.Id from Weather a ,Weather b 
where date_sub(b.RecordDate,interval 1 day) = a.RecordDate and a.Temperature < b.Temperature

解决三：

SELECT w1.Id FROM Weather w1, Weather w2
WHERE w1.Temperature > w2.Temperature AND TO_DAYS(w1.RecordDate)=TO_DAYS(w2.RecordDate) + 1;