What are composite indexes in SQL and how do they work?
An example of an AI chatbot conversation about composite indexes in SQL.
What are composite indexes in SQL and how do they work?
Composite indexes are indexes that use multiple columns to improve query performance. They allow the database to quickly locate rows based on the values of those columns.
Can you give me an example of when to use a composite index?
Sure! If you frequently query a table using both 'first_name' and 'last_name', a composite index on both columns can speed up those queries.
Are there any downsides to using composite indexes?
Yes, while they can improve read performance, composite indexes can slow down write operations like INSERT and UPDATE, as the index needs to be updated.
How do I create a composite index in SQL?
You can create a composite index using the CREATE INDEX statement. For example: CREATE INDEX idx_name ON table_name (first_name, last_name);.
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