In this video we are going to see how to fix below Oracle Database 12c Error Message.
ORA-00937: not a single-group group function.
Cause: A SELECT list cannot include both a group function, such as AVG, COUNT, MAX, MIN, SUM,
STDDEV, or VARIANCE, and an individual column expression, unless the individual column expression is included in a GROUP BY clause.
Action: Drop either the group function or the individual column expression from the
SELECT list or add a GROUP BY clause that includes all individual column expressions listed.
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