WHERE vs HAVING Clause in SQL: The Key Difference | T-SQL Course Part 9 скачать в хорошем качестве

WHERE vs HAVING Clause in SQL: The Key Difference | T-SQL Course Part 9

Are you confused about when to use WHERE and when to use HAVING? In this tutorial, we clear that confusion forever. Using our Insurance Table example, I will show you exactly how these two filtering clauses work in the SQL execution order. Key Concepts Explained: The WHERE Clause: How to filter individual rows from the original table before any grouping happens (e.g., filtering for a specific plan like 'PP'). The HAVING Clause: How to filter summary data after it has been grouped (e.g., finding only those employees whose Total Sales are greater than 10,000). Execution Order: Why SQL processes WHERE first and HAVING last. Aggregates: Why you cannot use functions like SUM or COUNT in a WHERE clause, and why they must go in the HAVING clause. Practical Demo: Real-world T-SQL script showing both clauses working together in a single query. Understanding this distinction is what separates a beginner from a professional SQL developer! #SQLServer #TSQL #SQLInterviewQuestions #WhereVsHaving #GroupBy #DataAnalysis #LearnSQL #DatabaseDevelopment