How do I create indexes in SQL to improve query performance?
An example of an AI chatbot conversation about creating SQL indexes for better performance.
How do I create indexes in SQL to improve query performance?
To create an index in SQL, you can use the CREATE INDEX statement. For example: CREATE INDEX index_name ON table_name (column_name); This will help speed up queries that search on the indexed column.
What types of indexes can I create?
You can create several types of indexes, including unique indexes, composite indexes, and full-text indexes. Each serves different purposes depending on your query needs.
Are there any downsides to using indexes?
Yes, while indexes can speed up read operations, they can slow down write operations like INSERT, UPDATE, and DELETE because the index needs to be updated as well.
How do I know if an index is being used?
You can use the EXPLAIN statement before your query to see if the index is being utilized. It will show you the query execution plan.
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