What does the "append" function in DQL do?

The "append" function in DQL (Dynatrace Query Language) is used to combine multiple queries vertically. This means that it allows you to stack the results of different queries on top of each other to form a single dataset. This is particularly useful when you want to consolidate data from different sources or different queries that return similar data structures, thus facilitating comprehensive analysis across the combined results.

For example, if you were querying the performance metrics of two different services and wanted to analyze them together, using the "append" function would let you create a new dataset that includes the results from both service queries. This vertical combination effectively enables deeper insights without needing to run subsequent analyses or manipulations separately.

The other choices do not accurately describe the primary function of "append." Splitting data into categories pertains to data organization but does not align with the appending process. Aggregating numerical data might involve functions like sum or average, which is not within the scope of appending. Creating a backup of query results suggests data preservation, differing from the combining function of "append."