Which of the following options about applying aggregation functions is false?

The statement that the output of the Aggregate will contain all attributes from the Source Entities plus the aggregation columns is misleading. When using an Aggregate in OutSystems, the output does not automatically include all attributes from the source entities if they are not explicitly selected. The purpose of an Aggregate is to allow for data processing and summarization; therefore, the output is typically limited to the attributes you define, especially in terms of aggregation.

For example, when you aggregate data to calculate sums, averages, or counts, it is common to select only the necessary fields for the output that are relevant to the computed results. Furthermore, columns that are displayed in grey typically represent attributes that are not part of the output; they are used for the aggregation but do not appear in the final results unless specified otherwise.

This nuanced understanding of aggregation in OutSystems ensures clarity in how data results are structured and helps in designing efficient data queries and structures in applications.