Learn the cause and how to resolve the ORA-00937 error message in Oracle.
When you encounter an ORA-00937 error, the following error message will appear:
- ORA-00937: not a single-group group function
The option(s) to resolve this Oracle error are:
Rewrite the SELECT statement so that the column or expression listed in the SELECT list is also found in the GROUP BY clause.
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:
You 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;