本篇包含Leetcode数据库部分一些有意思的Easy和Medium题目及其解析,出现在这里的简单和中等题目多是涉及一些生僻知识。 LC196 - Delete Duplicate Emails (Easy) 这是个简单题,但是涉及一些需注意的点: DELETE FROM table WHERE (subquery)的写法不可用: MySQL Error 1093 - Can't specify target table for update...
Finally, use the MIN() and MAX() functions in the HAVING clause to show winners between 20 and 30 years. Here’s also the code output. 2. Count Student Number in Departments The question from LeetCode asks you the following. “Write an SQL query to report the respective department name ...
swoole(4) redis(3) 编程技巧(2) nginx(1) git(1) centos7(1) 更多 1. Docker下MySQL忘记密码解决方法(2911) 2. PHP中获取文件扩展名(2779) 3. nginx配置反向代理转发(2141) 4. LeetCode--SQL 查询:查找所有至少连续出现三次的数字。(1744) 5. PHP使用CURL详解(1720) Copyright...
Here are5-7 quick tipsfor succeeding in anSQL interview: Master SQL Basics: Understand core concepts like SELECT, JOIN, GROUP BY, and aggregation functions. Practice Regularly: Solve SQL problems on platforms like LeetCode, HackerRank, or SQLZoo to sharpen your skills. Optimize Queries: Focus on...
Mastering the questions in each level on LeetCode is a good way to prepare for technical interviews and keep your skills sharp. They also have a repository of solutions with the reasoning behind each step. LeetCode has over 1,900 questions for you to practice, covering many different ...
The platform has over 40 SQL interview questions on topics such as conditional aggregation, string and window functions, and cumulative sums. 5. LeetCode If you are a Leetcode user, you can practice SQL on it too. Thecollection of SQL questionson LeetCode is quite diverse, with varying diff...
Solutions are at geeksforgeeks and leetcode Given 7 characters like in the scrabble word game, return a collection of words that use the 7 characters. E,g, a b d g o f f. Word "dog" and "off" use the 7 characters but "bed", "fool" does not. What if 1 out of 7 characters...
1. Google 1️⃣Code Jam 2️⃣Hash Code 3️⃣Kick Start 2. Facebook (Meta) 1️⃣Facebook Hackercup 2️⃣FB Hack 3. LeetCode 1️⃣Problems 2️⃣Contests 📕Weekly Contests 📕Biweekly Contests 3️⃣Study Plan 📕Comprehensive Study Plans ...
LeetCodePractice programming online A better approach might be to actually write some DevOps related scripts or projects. Start simple. Here are some ideas: Write a script that gets a number of instances and a name of a platform (AWS, local, Azure, ...) as parameters and provisions those...
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...