Leetcode 1789 Primary Department for Each Employee

LeetCode 1789 - Primary Department for Each Employee | CASE WHEN / UNION | Data Engineering with Aarish In this video, I solve LeetCode SQL Problem 1789 — Primary Department for Each Employee. We handle two cases — employees with a flagged primary department and those belonging to only one department — using UNION to combine both results cleanly. 🔗 LeetCode: https://leetcode.com/problems/primary... What you'll learn: ✅ UNION to combine two result sets ✅ Filtering with flag columns ✅ Handling single-row edge cases in SQL Data Engineering with Aarish — Real SQL. Real Pipelines. Real Interviews. #SQL #LeetCode #LeetCodeSQL #SQLInterview #SQLInterviewQuestions #SQLForBeginners #LearnSQL #MySQL #PostgreSQL #Database #DBMS #DataAnalytics #DataAnalyst #DataScience #CodingInterview #InterviewPrep #TechInterview #PlacementPrep #SQLQueries #SQLPractice #SQLProblems #DatabaseQueries #SQLJoins #GroupBy #HavingClause #Subquery #WindowFunctions #CTE #AggregateFunctions #Rank #DenseRank #RowNumber #CaseWhen #WhereClause #InnerJoin #LeftJoin #DataEngineering #FAANG #MAANG #Programming #Coding #ProblemSolving #100DaysOfCode #CodeNewbie #SoftwareEngineer #SDEInterview #SQLTutorial #Query #OrderBy