PLS-01472：In a set_function_specification, if DISTINCT is present, the expression must be a column_specification
错误码
错误描述：In a set_function_specification, if DISTINCT is present, the expression must be a column_specification
错误原因：In a set_function_specification, if DISTINCT is present, the expression must be a column_specification.
解决方法：n/a
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