ORA-00937: not a single-group group function ( Group By Error )

Option #1

Rewrite the SELECT statement so that the column or expression listed in the SELECT list is also found in the GROUP BY clause.

Option #2

Remove the GROUP BY function (ie: MIN Function, MAX Function, SUM Function, COUNT Function) from the SELECT statement.

Option #3

Remove the expression from the SELECT list that was not in the GROUP BY clause.

For example, if you had tried to execute the following SELECT statement:

SELECT department, MIN(salary) AS "Lowest salary"
FROM employees;

You would receive the following error message:

ou could correct this by including department in the GROUP BY clause as follows:

SELECT department, MIN(salary) AS "Lowest salary"
FROM employees
GROUP BY department;
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