SQL 50 : Leetcode 1978 - Employees Whose Manager Left the Company (Interview Essential!!) скачать в хорошем качестве

SQL 50 : Leetcode 1978 - Employees Whose Manager Left the Company (Interview Essential!!)

🏆 Master the SQL Interview Essential: LeetCode 1978! 🏆 Welcome to the SQL 50 series! In this highly requested video, we dive deep into a critical, must-know database problem for any aspiring Data Scientist, Data Analyst, or Data Engineer: LeetCode 1978 - Employees Whose Manager Left the Company. This problem is an absolute interview essential because it tests your mastery of fundamental SQL concepts that often trip up candidates. You will learn the most elegant and performant solution for querying a hierarchy table and handling edge cases. Here’s what you will master in this tutorial: Self-Joins: Effectively joining a table to itself to establish and query hierarchical relationships (Employee to Manager). NULL Value Handling: Best practices for dealing with employees who may not have a manager ID. Efficient Filtering: Using the WHERE clause with the NOT IN operator to find employees whose manager is not present in the Employee table. Writing Clean, Interview-Ready SQL Code: Crafting a query that is both logically sound and highly readable. This is a key building block for complex database queries, and mastering it will give you a significant edge in your technical interviews! Timestamps 0:00 - Introduction & The Problem Statement 1:35 - Understanding the Employee Table Schema 3:10 - Solution Approach: Using NOT IN 7:52 - Handling Edge Cases & NULL Values 10:15 - Final Optimized Solution & Review Continue Your SQL Journey 🔔 Subscribe for more interview-essential problem-solving videos! ➡️ Check out the full SQL 50 LeetCode Prep Playlist here:    • Leetcode SQL 50   #SQL #LeetCode #SQLInterview #DataScience #DataEngineer #Database #ProblemSolving #InterviewPrep