ORA-00979 not a GROUP BY expression
What causes an ORA-00979 error?
The GROUP BY clause does not contain all the expressions in the SELECT clause. SELECT expressions that are not included in a group function, such as AVG, COUNT, MAX, MIN, SUM, STDDEV, or VARIANCE, must be listed in the GROUP BY clause.
How Xynomix can help
Include in the GROUP BY clause all SELECT expressions that are not group function arguments.
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