[LeetCode]-DataBase-Rising Temperature

Posted 2020-06-27 练子

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 |
+----+

需求：查询今天气温比前一天的高的日期

CREATE TABLE Weather(
Id TINYINT UNSIGNED,
Date date,
Temperature TINYINT
)ENGINE=MyISAM CHARSET=utf8;

SELECT t1.Id
FROM Weather t1
WHERE t1.Temperature>(SELECT t2.Temperature
FROM Weather t2
WHERE t2.Date=ADDDATE(t1.Date,INTERVAL -1 DAY))