What are nested subqueries in SQL?
An example of an AI chatbot conversation about nested subqueries in SQL.
Can you explain what nested subqueries are in SQL?
Sure! A nested subquery is a query within another SQL query. It allows you to use the result of one query as a condition for another.
Can you give me an example of a nested subquery?
Of course! For instance, you can use a nested subquery to find employees who earn more than the average salary in their department.
How does the performance of nested subqueries compare to joins?
Nested subqueries can be less efficient than joins, especially with large datasets, as they may require multiple passes over the data.
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