LeetCode Rising Temperature
Problem
Given a Weather table, write a SQL query to find all dates’ Ids with higher temperature compared to its previous (yesterday’s) dates.
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+---------+------------+------------------+
| 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:
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+----+
| Id |
+----+
| 2 |
| 4 |
+----+
即找到与前一日相比温度升高的条目Id。
MySQL
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# Write your MySQL query statement below
SELECT w1.Id FROM Weather w1, Weather w2 WHERE w1.Temperature > w2.Temperature AND datediff(w1.date,w2.date) =1;
分析
主要是掌握MySQL的日期函数。
所有代码已上传至Github:https://github.com/lihongzheshuai/yummy-code
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