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1f54d3e · Dec 24, 2021

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0197.Rising Temperature

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题目描述

Weather

+---------------+---------+
| Column Name   | Type    |
+---------------+---------+
| id            | int     |
| recordDate    | date    |
| temperature   | int     |
+---------------+---------+
id 是这个表的主键
该表包含特定日期的温度信息

 

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

返回结果 不要求顺序

查询结果格式如下例:

Weather
+----+------------+-------------+
| id | recordDate | Temperature |
+----+------------+-------------+
| 1  | 2015-01-01 | 10          |
| 2  | 2015-01-02 | 25          |
| 3  | 2015-01-03 | 20          |
| 4  | 2015-01-04 | 30          |
+----+------------+-------------+

Result table:
+----+
| id |
+----+
| 2  |
| 4  |
+----+
2015-01-02 的温度比前一天高(10 -> 25)
2015-01-04 的温度比前一天高(20 -> 30)

解法

SQL

select w1.Id
from
    Weather w1,
    Weather w2
where
    DATEDIFF(w1.RecordDate, w2.RecordDate) = 1 and w1.Temperature > w2.Temperature