Watch 10 video solutions for Find Trending Hashtags II , a hard level problem involving Database. This walkthrough by Greg Hogg has 649,221 views views. Want to try solving it yourself? Practice on FleetCode or read the detailed text solution.
Table: Tweets
+-------------+---------+ | Column Name | Type | +-------------+---------+ | user_id | int | | tweet_id | int | | tweet_date | date | | tweet | varchar | +-------------+---------+ tweet_id is the primary key (column with unique values) for this table. Each row of this table contains user_id, tweet_id, tweet_date and tweet. It is guaranteed that all tweet_date are valid dates in February 2024.
Write a solution to find the top 3 trending hashtags in February 2024. Every tweet may contain several hashtags.
Return the result table ordered by count of hashtag, hashtag in descending order.
The result format is in the following example.
Example 1:
Input:
Tweets table:
+---------+----------+------------------------------------------------------------+------------+ | user_id | tweet_id | tweet | tweet_date | +---------+----------+------------------------------------------------------------+------------+ | 135 | 13 | Enjoying a great start to the day. #HappyDay #MorningVibes | 2024-02-01 | | 136 | 14 | Another #HappyDay with good vibes! #FeelGood | 2024-02-03 | | 137 | 15 | Productivity peaks! #WorkLife #ProductiveDay | 2024-02-04 | | 138 | 16 | Exploring new tech frontiers. #TechLife #Innovation | 2024-02-04 | | 139 | 17 | Gratitude for today's moments. #HappyDay #Thankful | 2024-02-05 | | 140 | 18 | Innovation drives us. #TechLife #FutureTech | 2024-02-07 | | 141 | 19 | Connecting with nature's serenity. #Nature #Peaceful | 2024-02-09 | +---------+----------+------------------------------------------------------------+------------+
Output:
+-----------+-------+ | hashtag | count | +-----------+-------+ | #HappyDay | 3 | | #TechLife | 2 | | #WorkLife | 1 | +-----------+-------+
Explanation:
Note: Output table is sorted in descending order by count and hashtag respectively.
