【MySQL】【leetcode】 Rising Temperature解题报告

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 |
+—-+
题目来源：https://leetcode.com/problems/rising-temperature/

代码

某一天的温度比前一天的温度高，则找出这一天的ID。MySQL的TO_DAYS(date)函数返回给定日期从年份0开始计算的天数。

# Write your MySQL query statement below
select wt2.id from Weather as wt1, Weather as wt2 where TO_DAYS(wt2.Date) - TO_DAYS(wt1.Date) = 1 and wt2.Temperature > wt1.Temperature;