best practice with SQL

• Take a functional approach when writing queries. Start with subqueries and then combine them. This makes it easier to validate each part and also compose reusable views. Simple subqueries are easier to write correctly, while complex queries are more prone to errors.
• Draw a relationship model diagram of the data tables. GUI tools can be used for querying, but searching can be slow with many tables. This is very helpful for new team members working on the project, avoiding repeated inquiries and potential mistakes.
• Standardize database validation mechanisms and document those. This benefits new team members and enhances the overall security of the project.
• Establish a data dictionary. Common sources of confusion include incorrect word usage, non-standard abbreviations, and a single word having multiple meanings within the database. A data dictionary helps everyone get familiar with the system quickly, improving efficiency and reducing the likelihood of project errors.