1. 题目

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 |
+----+

来源：力扣（LeetCode） 链接：https://leetcode-cn.com/problems/rising-temperature
著作权归领扣网络所有。商业转载请联系官方授权，非商业转载请注明出处。

2. 解题

# Write your MySQL query statement below
select w1.Id
from Weather w1, Weather w2
where date_sub(w1.RecordDate, interval 1 day) = w2.RecordDateand w1.Temperature > w2.Temperature

or

# Write your MySQL query statement below
select w1.Id
from Weather w1, Weather w2
where datediff(w1.RecordDate, w2.RecordDate) = 1and w1.Temperature > w2.Temperature

or

# Write your MySQL query statement below
select w1.Id
from Weather w1, Weather w2
where date_add(w2.RecordDate, interval 1 day) = w1.RecordDateand w1.Temperature > w2.Temperature

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