Array/list comparison vs. IN

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what is the difference between in and exists in sql Informational

• Critical scenarios for choosing IN/EXISTS How can you write SQL queries that are more likely to be optimized effectively by the database engine, regardless of whether you use IN or EXISTS?
• Relation of IN to semi-joins or other concepts
• Quick reference for IN and EXISTS When should you carefully consider the potential performance implications before deciding between IN and EXISTS?
• Potential downsides of manual optimization How does the performance of a correlated EXISTS subquery where the correlation is on a non-indexed column compare to one where it's on an indexed column?
• Optimizing nested subqueries with IN/EXISTS
• Illustrative uses of IN and EXISTS in SQL How do IN and EXISTS interact with indexes in SQL database tables?
• OLTP performance with IN/EXISTS
• 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?
• Ensuring up-to-date statistics How can you force or hint the database optimizer to use a specific type of join or a particular index when executing a query with IN or EXISTS?
• Finding any existence within sets How would you modify your approach if you needed to check if all elements from one set exist in another table?