How to display additional column information in Oracle group by query?

In Oracle, grouping queries use the GROUP BY clause to group the result set by specified columns. However, by default, only the grouped columns and aggregate function results are displayed.

If you want to display information from other columns, you can achieve this by combining aggregate functions with the GROUP BY clause.

For example, let’s say you have a table called “employees” that includes employees’ names, departments, and salaries. You want to group the employees by department, and display the average salary for each department along with the name and salary of the employee with the highest salary in each department.

SELECT department, AVG(salary), MAX(name), MAX(salary)
FROM employees
GROUP BY department;

In the above example, we used the AVG function to calculate the average salary for each department, and used the MAX function to identify the employee with the highest salary in each department by their name and salary information. It is important to note that the MAX function was used for string columns in order to display the employee names.

You can use this method to display information from other columns in a grouped query. Please adjust the column and table names in the query statement based on your specific needs.