Lc197-Rising Temperature

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) | RecordDate(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 |
+----+

来源：力扣（LeetCode）
链接：https://leetcode-cn.com/problems/rising-temperature
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# Write your MySQL query statement below
--笛卡儿积 加上时间做差函数
select a.id from weather a,weather b
where datediff(a.recorddate,b.recorddate) = 1
and a.temperature > b.temperature