Sql Programming Tutorials, Guides & Best Practices

To export an entire database, use the following command:

mysqldump -u your_username -p your_database_name > backup.sql

• 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;

SELECT name FROM employees_us
UNION ALL
SELECT name FROM employees_uk;

Window functions calculate values across a set of rows related to the current row without collapsing rows into groups.

The INNER JOIN is used to retrieve rows with matching values in both tables.

SELECT columns
FROM table1
INNER JOIN table2
ON table1.common_column = table2.common_column;