Forward Fill NULLs using FIRST_VALUE() | This SQL Interview Trick Blew My Mind 🤯 | SQL Interview скачать в хорошем качестве

Forward Fill NULLs using FIRST_VALUE() | This SQL Interview Trick Blew My Mind 🤯 | SQL Interview

🔥 SQL Interview Favorite – Forward Fill NULLs Like a Pro! Have you ever been asked to forward fill `NULL` values in SQL with the last non-NULL value? This is a classic data engineering interview question — and many folks get stuck here! 👨‍💻 Problem: You're given a `Stocks` table with `DateKey`, `StockName`, and `Price`. You need to derive a new column `MarketPrice` that fills `NULL` values with the last known non-NULL price — in the correct order. Insert Statements: create table Stocks (DateKey Date, StocksName varchar(20), Price int ); insert into Stocks values ('20230101','Infosys',1400) ,('20230102','Infosys',null) ,('20230103','Infosys',1450) ,('20230104','Infosys',null) ,('20230105','Infosys',null) ,('20230105','Infosys',null) ,('20230101','Reliance',2300) ,('20230102','Reliance',NULL) ,('20230103','Reliance',null) ,('20230104','Reliance',2375) ,('20230105','Reliance',2400) ,('20230106','Reliance',null) In this video, I’ll walk you through: ✅ How to think through the logic ✅ Using `FIRST_VALUE()` cleverly to solve this ✅ A real-world approach that’ll impress any interviewer If you're preparing for SQL interviews, this is a must-know trick 💡 No need to memorize — just understand the thought process. 🧠 Whether you're applying for FAANG or startups, mastering NULL handling and window functions can be a game-changer. Boost your SQL & data skills daily: 🔗 Follow Aditya Bansal on LinkedIn:   / adityabansal095   📢 Join the SQL JUNCTION Telegram Channel (1,400+ members): [https://t.me/sqljunction] 🚀 Daily content | Job prep | Real interview questions Keywords: SQL Server Interview Questions ,complex analysis interview questions,sql interview for freshers, sql amazon interview questions, sql hackerrank challenges 👉 Don’t forget to like, comment, and subscribe for more real SQL questions! #SQLInterview #SQLServer #SQLChallenge #DataEngineering #SQLTutorial #AdityaBansal #SQLJunction #DataScienceInterview #SQLQuestion #TechInterview #AdvancedSQL #interviewprep