197. 上升的温度

题目描述

给定一个 Weather 表，编写一个 SQL 查询，来查找与之前（昨天的）日期相比温度更高的所有日期的 Id。

+---------+------------------+------------------+
| 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 |
+---------+------------------+------------------+

例如，根据上述给定的 Weather 表格，返回如下 Id:

+----+
| Id |
+----+
|  2 |
|  4 |
+----+

分析

跟昨天的数据连表，连表的条件是SUBDATE(a.RecordDate,1) = b.RecordDate

代码

# Write your MySQL query statement below
SELECT 
    a.Id 
from
    Weather a,
    Weather b
where
    SUBDATE(a.RecordDate, 1) = b.RecordDate and a.Temperature > b.Temperature
;

题目链接

https://leetcode-cn.com/problems/rising-temperature/description/