Interaction of different query components Discuss the impact of using views with complex logic (including IN or EXISTS) when these views are joined with other tables in a query.

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what is the difference between in and exists in sql Informational

• Comparing all/any/exists semantics How does the ANY or SOME keyword with subqueries relate to the IN operator?
• Structuring queries for better optimization How does the number of joins in a query that also includes IN or EXISTS subqueries affect the overall performance and the optimizer's choices?
• SQL ALL keyword vs. IN/EXISTS
• Evaluating query efficiency Can you provide examples of how different database management systems (e.g., MySQL, PostgreSQL, SQL Server, Oracle) might handle the same query with IN and EXISTS differently in terms of execution plan and performance?
• Exploring proprietary SQL features For example, how do array or list comparison features in some databases relate to the functionality of IN?
• Structuring queries with IN/EXISTS How does the use of window functions in the outer query interact with subqueries using IN or EXISTS?
• Understanding query flow How does the size and distribution of data in the tables involved affect the relative performance of IN and EXISTS?
• Writing optimizer-friendly SQL for IN/EXISTS
• Improving readability with CTEs Discuss the impact of using views that are based on queries with IN or EXISTS on the performance of other queries that use these views.
• Optimizing data retrieval How does the use of computed columns affect the performance of IN and EXISTS if these columns are involved in the subquery or the outer query's filtering conditions?