[SQL]197. Rising Temperature

标签：div   yesterday   follow   amp   nbsp   from   find   ted   log   

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 |
+----+

1 # Write your MySQL query statement below
2 select w1.Id
3 from Weather w1,Weather w2
4 where datediff(w1.Date,w2.Date)=1
5 and w1.Temperature>w2.Temperature;

[SQL]197. Rising Temperature

标签：div   yesterday   follow   amp   nbsp   from   find   ted   log   

原文地址：http://www.cnblogs.com/fcyworld/p/6500988.html