LeetcodeRising Temperature
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题目链接:https://leetcode.com/problems/rising-temperature/
题目:
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 |
+—-+
思路:
二表联查
算法:
SELECT w1.Id FROM Weather w1 INNER JOIN Weather w2
ON TO_DAYS(w1.Date) = TO_DAYS(w2.Date) + 1 AND w1.Temperature > w2.Temperature
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