Leetcode 197. Rising Temperature (Database)

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 |
+----+

思路：

TO_DAYS(date)可以将日期转换成公元后的天数。

 

# Write your MySQL query statement below
select w1.Id from Weather as w1, Weather as w2
WHERE TO_DAYS(w1.Date) = TO_DAYS(w2.Date) + 1 and w1.Temperature > w2.Temperature