197. Rising Temperature

最新推荐文章于 2024-10-07 22:24:34 发布

SnailRunFast

最新推荐文章于 2024-10-07 22:24:34 发布

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分类专栏： Leet Code SQL 文章标签： Rising Temperature

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本文介绍了一种SQL查询方法，用于从气象数据表中找出所有温度比前一天高的日期的ID。通过使用日期差和温度比较，可以有效地筛选出符合条件的数据。

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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 |
+----+

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MySQL:

# Write your MySQL query statement below

select
    a.Id
from
    Weather a,
    Weather b
where
    datediff(a.Date, b.Date) = 1
    and a.Temperature > b.Temperature
;