event_date) = -1 ## Ref: https://lifewithdata.com/2021/08/03/sql-interview-questions-leetcode-550-game-play-analysis-iv/11 - 571H 给定数字的频率查询中位数 Find Median Given Frenquency of Numbers此题的一个经典解法是,找出那些不管是正序累积频数求和,还是逆序累积频数求和的数字,进行平均即可...
leetcode 主要是一个针对北美的coder人群找工作的代码练习网站,我在2015年初次接触这个网站的时候,总共只有200多道题目,是一个类似acm 的a题网站。这些年变化越来越大,主要是因为找工作当然是多样化的考核过程,leetcode 也逐渐与时俱进,推出了下面几个类别的联系,今天我们随便挑几个练习一下: 175. Combine Two Ta...
觉得不错,记录一下 转载:https://www.yanxurui.cc/posts/mysql/2016-11-10-10-sql-interview-questions/ 很多查询都可以用经典的学生-课程-成绩案例来表示 表结构 学生表student(id,name) 列表项目 课程表cours
3. SQLZoo: sqlzoo.net/ 4. Zachary Thomas' SQL Questions(谷歌产品分析师出的面试题和讲解) lnkd.in/g-JJzuD 5. Leetcode: lnkd.in/g3c5JGC 6. Kaggle Advanced SQL: lnkd.in/dfzPjjJ 7. 窗口函数练习:Window Functions: lnkd.in/dGzk-v7 8. A collection of data science Take home challen...
LeetCode 181 - Employees Earning More Than Their Managers - PostgreSQL Solution More Tips SQL Server 2012 What's New in SQL Server 2012 What's New in SQL Server 2012 SQL Server 2012 Editions and Licensing - Frequently Asked Questions
Practice Regularly: Solve SQL problems on platforms like LeetCode, HackerRank, or SQLZoo to sharpen your skills. Optimize Queries: Focus on writing efficient queries by using proper indexing and understanding query plans. Know Advanced Concepts: Be prepared to discuss window functions, CTEs, normalizat...
参考leetcode: rank-scores 2. 写一个函数,获取第 N 高的分数 create function getNthHighestScore(N int) return int begin declare M int default N-1; return ( select distinct score from student order by score desc limit M, 1; ) end; ...
LeetCode: Provides SQL challenges and contests to test and improve your SQL skills. HackerRank: Offers a SQL domain with a wide range of SQL problems and challenges. Codecademy: Features an interactive SQL course with hands-on exercises for beginners and intermediates. ...
LeetCode also has a good collection of SQL problems which are good to improve your SQL query skills and I suggest you take a look at those problems if you want to improve your SQL query skills. Other related SQL queries, Interview questions, and articles: How to join three tables in one...
参考leetcode: rank-scores #2. 写一个函数,获取第 N 高的分数 create function getNthHighestScore(N int) return int begin declare M int default N-1; return ( select distinct score from student order by score desc limit M, 1; ) end; select getNthHighestScore(2); ...