当使用聚合函数时,默认情况下,汇总信息包含所有指定的行。
When you use an aggregate function, by default the summary information includes all specified rows.
在多于一个栏位的情况下不能使用聚合函数来对一个表的行进行分组。
F. You can not group by the rows of a table by more than one column while using aggregate functions.
如果一个度量引用其他度量,那么在为它产生SQL表达式时,不能使用聚合函数来为嵌套的度量产生SQL表达式。
When generating SQL expressions for measures that reference other measures, the aggregation function might not be used to form the SQL expression for the nested measures.
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