leetcode:197. Rising Temperature

197. Rising Temperature

Description

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 |
+----+

Answer

SELECT
    Weather.id AS 'Id'
FROM
    Weather ,Weather w 
    where DATEDIFF(Weather.RecordDate,w.RecordDate)=1 and Weather.Temperature > w.Temperature