Explain Development Tutorials, Guides & Insights

CREATE INDEX index_name ON table_name(column_name);

For example, to create an index on the last_name column of a users table:

• WHERE clause: Index columns frequently used in WHERE conditions to speed up searches.
• JOIN clause: Index columns used in joins to improve join performance.
• ORDER BY clause: Index columns used in sorting to avoid sorting operations.

While indexes improve read performance, they can slow down write operations (INSERT, UPDATE, DELETE). Only create indexes on columns that benefit the most from indexing.

• Index frequently queried columns.
• Remove unused indexes.
• Regularly analyze and maintain indexes.

SELECT name, salary
FROM employees
WHERE department = 'Engineering' AND salary > 70000
ORDER BY salary DESC;