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I tried following query:
SELECT
MAX(SUM(e.Empid))
FROM HR.Employees
and got following error:
Cannot perform an aggregate function on an expression containing an aggregate or a subquery.
My question is why isn’t this allowed?
since you have not define any columns to be grouped, The value of
SUM()is equal toMAX()UPDATE
An error was thrown because
MAX(SUM(e.Empid))requires the results of two grouped selects, not just one.