ORA-00934
Error: ORA-00934: group function is not allowed here
Causa: One of the group functions, such as AVG, COUNT, MAX, MIN, SUM, STDDEV, or VARIANCE, was used in a WHERE or GROUP BY clause.
Acción: Remove the group function from the WHERE or GROUP BY clause. The desired result may be achieved by including the function in a subquery or HAVING clause.
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