What is Correlated Subquery in Structured Query Language SQL
What is Correlated Subquery in SQL?
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Chapters:
00:06 - Introduction to Correlated Subqueries in SQL
00:10 - What is a Correlated Subquery in SQL?
00:15 - How Correlated Subqueries Work in SQL
00:20 - Execution of Correlated Subqueries in SQL
00:25 - Usage of Correlated Subqueries for Operations in SQL
00:32 - Practical Example of Correlated Subquery in SQL
00:37 - Example Explanation: Employee Salaries
00:44 - Task: Comparing Salaries with Average Salary in SQL
00:49 - Using Correlated Subqueries for Average Salary Comparison in SQL
00:55 - Practical Query Example and Output
01:00 - Writing and Testing the Correlated Subquery
01:07 - Comparing Results with Average Salary
01:13 - Understanding the Output
01:19 - Conclusion and Summary
The concept of correlated subqueries in SQL is explained. A correlated subquery is one that refers to columns from the outer query, creating a relationship between the subquery and the outer query. It is executed for each row processed by the outer query using values from that row.
The example given involves an employee table with salaries. The task is to retrieve records of employees whose salaries are higher than the average salary of the organization. The video demonstrates how to write and execute such a query using a correlated subquery. The main focus is on using the WHERE clause to compare each employee's salary against the average salary, retrieving only those records that meet the condition. The video concludes with a practical demonstration of this query.
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