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.

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。

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Columns and attributes markers are substituted the same way as they are for attributes, so the SQL expression resulting from the SQL expression template will be.

按照与属性相同的方式，对列和属性标志进行替换，所以从SQL表达式模板产生的SQL表达式是。

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Then apply the aggregation function to the SQL expression resulting from the SQL expression template to form the SQL expression for the measure.

然后，对从SQL表达式模板产生的SQL表达式应用聚合，形成度量的SQL表达式。

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