如果从HackerRank首页进入，先点击Sign up and practice按钮，注册或登录 再在Prepare页面找到Prepare By T...
SQLstands for Structured Query Language. It is a language that lets you interact with databases. SQL is used to manage relational databases, the most common type of database in practice. The ability to use SQL will help you get more out of your data than just reading it. It can be used...
Practice exercises (queries) in PL/SQL 🐸. sql sql-server plsql sqldeveloper Updated Jul 14, 2023 GradedJestRisk / db-training Star 5 Code Issues Pull requests Use, install, performance mysql sql database postgresql plsql oracle-database sqldeveloper Updated Dec 12, 2024 PLpgSQ...
SQL/MySQL Cheatsheet and Practice Questions mysql sql cheatsheet mysql-solutions hackerrank-sql-solutions sql-practice sql-cheatsheet sql-solutions Updated Oct 25, 2022 dori-dev / sql-cheatsheet Star 3 Code Issues Pull requests SQL cheat sheet for simple sql commands. mysql sql database sqli...
Here are a few good practice resources: Solve SQL | HackerRank SQL Fiddle The SQL Murder Mystery | Knightlab
Hands-On Practice:Dive headfirst into practical exercises and real-world scenarios to bolster your SQL proficiency. Engage with platforms like HackerRank to tackle coding challenges and refine your problem-solving skills. Interactive Learning Platforms:Explore interactive learning platforms such as DataCamp...
As you progress, consider extending your SQL skill set with additional resources. Sites likew3schools SQL TutorialandSQL Practice Exercises on SQLBoltprovide additional study materials and exercises. Additionally,HackerRank's SQL problemsprovide goal-oriented query practice. Whether you're building a compl...
Practice, Practice, Practice Learning all the concepts listed above will help you build a strong foundation of programming with SQL. However, in order to tackle real-world use-cases, you need to practice a lot. HackerRankandPGExercisesare two platforms that can help you do this. They have a...
q2.difficult_level,ROUND(count(u.question_cnt)/count(DISTINCT(u.device_id)),4)asavg_answer_cntfromuser_profile ujoinquestion_practice_detail q1onu.device_id=q1.device_idjoinquestion_detail q2onq1.question_id=q2.question_idwhereu.university='山东大学'groupby1,2; ...
This query first uses a Common Table Expression (CTE) to select the top three distinct salaries from the Employee table, ordered by salary in descending order. The CTE is then used to select the minimum salary from that list of top three salaries, which is the third highest salary in the...