ORA-00937 Error Message
Learn the cause and how to resolve the ORA-00937 error message in Oracle.
Description
When you encounter an ORA-00937 error, the following error message will appear:
- ORA-00937: not a single-group group function
Cause
You tried to execute a SELECT statement that included a GROUP BY function (ie: MIN Function, MAX Function, SUM Function, COUNT Function), but was missing the GROUP BY clause.
Resolution
The option(s) to resolve this Oracle error are:
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:
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;
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