Sql Programming Tutorials, Guides & Best Practices

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

CREATE INDEX idx_last_name ON users(last_name);

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.

The EXPLAIN command provides insights into how MySQL executes a query. It helps identify performance bottlenecks and areas for improvement.

• 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;