SQL/197. rising_temperature.sql at main · Parul240/SQL · GitHub

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PROBLEM:

197. Rising Temperature

Table: Weather

+---------------+---------+
| Column Name   | Type    |
+---------------+---------+
| id            | int     |
| recordDate    | date    |
| temperature   | int     |
+---------------+---------+
id is the primary key for this table.
This table contains information about the temperature on a certain day.


Write an SQL query to find all dates Id with higher temperatures compared to its previous dates (yesterday).

Return the result table in any order.

The query result format is in the following example.


Example 1:

Input:
Weather table:
+----+------------+-------------+
| id | recordDate | temperature |
+----+------------+-------------+
| 1  | 2015-01-01 | 10          |
| 2  | 2015-01-02 | 25          |
| 3  | 2015-01-03 | 20          |
| 4  | 2015-01-04 | 30          |
+----+------------+-------------+
Output:
+----+
| id |
+----+
| 2  |
| 4  |
+----+
Explanation:
In 2015-01-02, the temperature was higher than the previous day (10 -> 25).
In 2015-01-04, the temperature was higher than the previous day (20 -> 30).


SOLUTION:

# Write your MySQL query statement below

SELECT w1.id
FROM Weather w1
JOIN Weather w2 ON w1.recordDate = DATE_ADD(w2.recordDate, INTERVAL 1 DAY)
WHERE w1.temperature > w2.temperature


#This code is contributed by Parul Sharma