How To Write SQL Server Queries Correctly: Joins With OR Clauses Part 1 скачать в хорошем качестве

How To Write SQL Server Queries Correctly: Joins With OR Clauses Part 1

In this video, I delve into the intricacies of joins involving OR clauses in SQL Server, demonstrating how and why SQL Server behaves differently when dealing with these constructs. I start by setting up a simple example to illustrate how SQL Server can infer join conditions from where clauses effectively. However, as we move on to more complex scenarios involving left joins and multiple tables, the video reveals some of the challenges and quirks that arise, particularly when OR clauses span different tables. I walk through these examples step-by-step, showing how subtle changes in query structure can significantly impact performance and execution plans. By the end of this part, you'll have a better understanding of what to look out for and how to optimize your queries to avoid common pitfalls. CHAPTERS 00:00:00 - Introduction 00:02:15 - Setting Up the Example 00:03:08 - Join Predicate Warning 00:04:01 - Optimizer's Insight 00:06:19 - Or Clause Evaluation 00:07:05 - Optimizing the Query 00:08:22 - Complexity in Queries 00:09:05 - Next Steps ━━━━━━━━━━━━━━━━━━━━━━━━━━ 📚 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   ━━━━━━━━━━━━━━━━━━━━━━━━━━