How To Write The “where” Clause In Soql When Group By Is Used in Salesforce?

Adding some points:

SELECT * FROM `movies` GROUP BY `category_id`,`year_released` HAVING `category_id` = 8;

The GROUP BY Clause is used to group rows with same values .
The GROUP BY Clause is used together with the SQL SELECT statement.
The SELECT statement used in the GROUP BY clause can only be used contain column names, aggregate functions, constants and expressions.
The HAVING clause is used to restrict the results returned by the GROUP BY clause.

Thanks