What is a composite index and when should I use one?
A composite index is an index on multiple columns of a table. You should use one when queries filter or sort on multiple columns.
Can you give me an example of when a composite index would be beneficial?
Sure! If you frequently query a table for both 'last_name' and 'first_name', a composite index on both columns can speed up those queries.
Are there any downsides to using composite indexes?
Yes, composite indexes can increase the time it takes to insert, update, or delete records, as the index needs to be maintained.
How do I create a composite index in SQL?
You can create a composite index in SQL using the CREATE INDEX statement, specifying multiple columns like this: CREATE INDEX idx_name ON table_name (column1, column2);
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