Mastering the GROUP BY Clause in SQL

GROUP BY in SQL
The GROUP BY clause in SQL is a powerful tool for organizing and summarizing data in your relational database. It allows you to group rows that share the same values in one or more columns and then perform aggregate functions (functions that operate on entire groups) on those groups.
Key Points:
Used in conjunction with the SELECT statement to retrieve and manipulate data.
Placed after the WHERE clause (if used) and before the ORDER BY and HAVING clauses (if used).
Groups rows based on column values, enabling calculations on these groups.
Commonly used with aggregate functions like SUM(), COUNT(), AVG(), MAX(), and MIN() to compute totals, averages, and extremes within groups.
Can group by multiple columns to create more granular groupings.