What are some lesser-known features of SQL that can enhance query performance?
Database indexing is crucial for performance, but many developers overlook the importance of choosing the right type of index. Clustered indexes, for example, can significantly speed up queries by physically sorting the underlying data.
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Window functions are also often overlooked but can greatly improve performance. They allow you to perform calculations across a set of rows without the need for self-joins or subqueries.
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Another lesser-known feature is the EXPLAIN keyword, which provides information about the query execution plan. It helps identify inefficient queries and suggests ways to optimize them.
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Finally, SQL allows for query tuning by utilizing hints. By providing hints to the query optimizer, you can guide it towards a more efficient execution plan.
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One lesser-known feature is the use of materialized views, which allow you to pre-compute and store the results of a query so that it can be retrieved faster in the future.
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Parallel query execution is another powerful but lesser-known feature. It allows the database to divide the workload across multiple processors or cores, resulting in faster query execution times.
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SQL
2024-06-11 15:38:03
In what scenarios have you found SQL to be particularly powerful and efficient?
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