What are SQL subqueries and how do they work?
An example of an AI chatbot conversation about SQL subqueries and their functionality.
What are SQL subqueries and how do they work?
SQL subqueries are queries nested inside another SQL query. They can be used to retrieve data that will be used in the main query.
Can you give me an example of a subquery?
Sure! For instance, you can use a subquery to find employees who earn more than the average salary in their department.
How do I write a subquery in SQL?
You can write a subquery by enclosing it in parentheses. For example: SELECT * FROM employees WHERE salary > (SELECT AVG(salary) FROM employees);
Are there any performance considerations with subqueries?
Yes, subqueries can sometimes be less efficient than joins, especially if they return a large dataset. It's important to analyze performance.
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