ORA-30482：DISTINCT option not allowed for this function
错误码
错误描述：DISTINCT option not allowed for this function
错误原因：The aggregation function did not support the DISTINCT option.
解决方法：If DISTINCT functionality is desired, rewrite the expression. Apply the DISTINCT clause in a nested SELECT statement to produce the desired values, and then apply the aggregation function in an outer SELECT statement.
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