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Join Simplification In SQL Server

In this video, I dive into the fascinating world of joint simplification within SQL Server queries. I explore how and when joins can be simplified by the query optimizer, discussing specific scenarios where simplification is not possible due to potential null values or unique key constraints. Additionally, I demonstrate practical examples that showcase how SQL Server optimizes complex queries by pruning unnecessary join operations, leading to more efficient execution plans. Along the way, I share some personal insights and humorous anecdotes about my current setup, including dealing with an overly enthusiastic allergy attack that left its mark on my recording session. CHAPTERS 00:00:00 - Introduction 00:00:31 - Green Screen Setup 00:01:00 - Joint Simplification Rules 00:01:50 - Right Outer Join Example 00:02:44 - Fake Join Explanation 00:03:31 - Inner Join Self-Reference 00:04:43 - Large Query Simplification 00:05:30 - Query Optimizer Laziness 00:06:14 - Contradiction Detection 00:06:39 - Comma Separated List Example 00:07:08 - Video Setup Notes ━━━━━━━━━━━━━━━━━━━━━━━━━━ 📚 TRAINING & COURSES ━━━━━━━━━━━━━━━━━━━━━━━━━━ Get AI-Ready With Erik https://training.erikdarling.com/get-... SQL Server Performance Engineering Course https://training.erikdarling.com/sql-... Learn T-SQL with Erik https://training.erikdarling.com/lear... Everything Bundle: https://training.erikdarling.com/?cou... ━━━━━━━━━━━━━━━━━━━━━━━━━━ 🛠️ CONSULTING & SERVICES ━━━━━━━━━━━━━━━━━━━━━━━━━━ Need SQL Server performance help? https://training.erikdarling.com/sqlc... ━━━━━━━━━━━━━━━━━━━━━━━━━━ 💬 CONNECT ━━━━━━━━━━━━━━━━━━━━━━━━━━ Ask questions at Office Hours https://erikdarling.com/officehours/ Become a channel member    / @erikdarlingdata   ━━━━━━━━━━━━━━━━━━━━━━━━━━