What is Group By clause in SQL?

The GROUP BY statement groups rows that have the same values into summary rows, like “find the number of customers in each country”.

The GROUP BY statement is often used with aggregate functions (COUNT(), MAX(), MIN(), SUM(), AVG()) to group the result-set by one or more columns.


SELECT column1, column2 
FROM table_name 
WHERE [ conditions ] 
GROUP BY column1, column2 
ORDER BY column1, column2