197. Rising Temperature
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 |
+----+
大体意思
写 SQL 查询出温度比昨天大的日期 Id
别人的解法
The DATEDIFF()
function returns the time between two dates
SELECT w1.Id FROM Weather w1, Weather w2
WHERE w1.Temperature > w2.Temperature AND (DATEDIFF(w1.Date, w2.Date) = 1 )
Reference: LeetCode Q197 Rising Temperature | Lei Jiang Coding