21 good habits of SQL

1. Use comments to explain the purpose of each table and view and the meaning of each column.
2. Use canonical naming conventions for tables, columns, views, and other objects.
3. Avoid using SELECT * in your queries, instead select only the columns you need.
4. Use table aliases in queries to improve readability.
5. Use JOIN statements such as INNER JOIN, LEFT JOIN, and RIGHT JOIN to join multiple tables instead of using the WHERE clause.
6. Use indexes to improve query performance. But don't abuse indexes because they add overhead to insert, update, and delete operations.
7. Avoid using functions in queries as they can affect performance.
8. Use the GROUP BY and HAVING clauses to group and filter results.
9. The results are sorted using the ORDER BY clause.
10. Avoid using subqueries in queries as they can affect performance.
11. Use transactions to ensure data integrity and consistency.
12. Use views to simplify complex queries, improve readability, and share the same logic across multiple queries.
13. Use stored procedures and functions to encapsulate complex business logic, improving performance and maintainability.
14. Use foreign keys to establish relationships between tables and ensure data consistency.
15. Use CHECK constraints to limit the values ​​in a column.
16. Avoid storing duplicate data in the database and use association tables to resolve many-to-many relationships.
17. Back up your database regularly to prevent data loss.
18. Use database connection pooling to improve performance and scalability.
19. Avoid using dynamic SQL as they are vulnerable to SQL injection attacks.
20. Regularly clean up useless data and logs to reduce the size of the database.
21. Use appropriate data types to store data to save storage space and improve performance.