【leetcode Database】197. Rising Temperature

题目：

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 |+----+

解析：

本题可以用自连接来做，用表的别名来解决即可。代码如下：

# Write your MySQL query statement belowSELECT a.Id  FROM Weather a,Weather b WHERE a.Temperature > b.Temperature AND a.Date = ADDDATE(b.Date,1);