Sql Tutorial Development Tutorials, Guides & Insights

mysqldump -u username -p database_name > backup_filename.sql

• username: Your MySQL username.
• database_name: The name of the database you want to back up.
• backup_filename.sql: The name of the file where the backup will be stored.

mysqldump -u your_username -p your_database_name your_table_name > table_backup.sql

To export only the database schema without data, use the --no-data option:

-- Avoid
SELECT * FROM employees WHERE UPPER(name) = 'ALICE';
-- Prefer
SELECT * FROM employees WHERE name = 'Alice';

SELECT name FROM employees ORDER BY salary DESC LIMIT 10;

SELECT sale_id, employee_id, amount,
       LEAD(amount, 1) OVER (ORDER BY sale_id) AS next_sale
FROM sales;

Advanced SQL techniques like subqueries, unions, and window functions allow you to solve complex data challenges and gain deeper insights. Practice these concepts on real-world datasets to strengthen your SQL skills and become proficient in handling advanced query scenarios.

Consider a employees table where we want to find employees who work in the same department:

SELECT a.name AS Employee1, b.name AS Employee2, a.department_id
FROM employees a, employees b
WHERE a.department_id = b.department_id AND a.employee_id != b.employee_id;