SQL Correlated Sub Query Explained: Fetch Employees with Above-Average Salary Using CTEs!

Description:
For Complete Source: visit https://www.businessintelligence.bi/2025/03/05/sql-correlated-sub-query-explained-fetch-employees-with-above-average-salary-using-ctes/
In this video, we break down an advanced SQL query step by step! Learn how to use Common Table Expressions (CTEs) to fetch the latest salary and department of employees, filter out those earning above the department’s average salary, and optimize queries using ROW_NUMBER() and JOINs. Perfect for SQL learners and database professionals! 🚀

🔹 Topics Covered:
✅ Understanding CTEs (Common Table Expressions)
✅ Using ROW_NUMBER() for ranking data
✅ Filtering employees with higher-than-average salary
✅ Writing optimized JOINs and subqueries

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⏳ Timeline & Key Topics:

00:00 - Overview 📝 Introduction to the SQL query and what we will cover.
01:32 - Understanding the Query 🔍 Breaking down the purpose and structure of the query.
01:53 - What is a Correlated Subquery? 🔄 Understanding how correlated subqueries work in SQL.
02:53 - Getting Employees with Above-Average Salary 📊 How to filter employees with a salary greater than their department’s average.
04:06 - Step 1: Creating CTE (Common Table Expressions) 📌 Introduction to CTEs and their use in the query.
05:27 - Ranking Pay Rate for Each Employee 💰 Using ROW_NUMBER() to identify the latest salary.
06:48 - Ranking Latest Department 🏢 Fetching the most recent department using ROW_NUMBER().
08:35 - Fetching Employee Details After SELECT Statement 📄 Retrieving employee details, salary, job title, and department name.
10:26 - Joining Tables 🔗 Understanding SQL joins to connect multiple tables effectively.
14:00 - Filtering Employees with Above-Average Salary ⚖️ Applying the WHERE clause to select high-salaried employees.
16:00 - Explanation of the Correlated Query Clause 🔄 How correlated subqueries function inside the main query.
23:20 - How Correlated Queries Fetch Above-Average Salaries 🏆 Step-by-step explanation of how correlated queries work in this scenario.

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Видео SQL Correlated Sub Query Explained: Fetch Employees with Above-Average Salary Using CTEs! канала Smart Data Learners