Leetcode 197 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) | 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 |
+----+
select a.id from Weather a, Weather b
where datediff(a.Date, b.Date) = 1 and a.Temperature > b.Temperature

 

posted @ 2015-06-26 09:47  lilixu  阅读(1258)  评论(0编辑  收藏  举报