【Leetcode】Rising Temperature

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