How to use oracle group by?

@ryan.murray 

To use Oracle GROUP BY, follow these steps:

1. Write a SELECT statement to retrieve data from the database table.
2. Include the GROUP BY clause at the end of the SELECT statement.
3. Specify the columns that you want to group by in the GROUP BY clause.
4. You can also use aggregate functions such as SUM, AVG, COUNT, MIN, and MAX with the GROUP BY clause to perform calculations on the grouped data.
5. Execute the SELECT statement to retrieve the grouped data from the database table.

Example:

1
2
3

SELECT department_id, AVG(salary)
FROM employees
GROUP BY department_id;

In this example, we are retrieving the average salary for each department by grouping the data by the department_id column from the employees table.