What are best practices for using HAVING clause?

The HAVING clause in SQL is used to filter records that work on summarized GROUP BY results. It's important to use it effectively to ensure optimal performance and clarity in your queries. Here are some best practices for using the HAVING clause:

• Use HAVING for Aggregate Functions: Use it only when you need to filter groups created by aggregate functions like SUM(), COUNT(), AVG(), etc.
• Combine with GROUP BY: Always use the HAVING clause in conjunction with GROUP BY to ensure you're filtering aggregated data.
• Avoid Using HAVING When Not Necessary: If you can use WHERE instead of HAVING, prefer WHERE for better performance since WHERE filters data before it's grouped.
• Keep Conditions Simple: Try to keep the conditions in the HAVING clause as simple and direct as possible to ensure query readability and maintainability.
• Order of Performance: Remember that HAVING is processed after the GROUP BY, so be aware of the order of execution when writing complex queries.