ORA-00934: group function is not allowed here

I got ” ORA-00934: group function is not allowed here ”  error in Oracle database.

ORA-00934: group function is not allowed here

Details of error are as follows.

SELECT name, surname count(*) FROM employee WHERE Count(*) > 1 GROUP BY surname;

ORA – 00934: GROUP FUNCTION IS NOT ALLOWED HERE

00964, 00000 – “group function is not allowed here”

GROUP FUNCTION IS NOT ALLOWED HERE

This ORA-00934 error is related to the group function which is not allowed.

You need to use HAVING CLAUSE For filtering if you use Aggregate function ( AVG, COUNT, MAX, MIN, SUM, STDDEV, or VARIANCE, ) in where clause.

To solve this error, use HAVING clause instead of where like following.

SELECT name, surname count(*) FROM employee GROUP BY surname HAVING Count(*) > 1;

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