Sql Programming Tutorials, Guides & Best Practices

When dealing with large datasets, consider the following tips:

• Increase Timeout Settings: Adjust max_allowed_packet and net_read_timeout in your MySQL configuration to handle large imports.
• Use --single-transaction for Exports: This option helps reduce locking issues during exports by maintaining a consistent snapshot of the database.

• 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 column1, window_function() OVER (PARTITION BY column ORDER BY column)
FROM table;

Rank sales amounts for each employee:

SELECT columns
FROM table1
CROSS JOIN table2;

Using the same tables, to generate a combination of all employees and all departments: