What requirement must you meet when mapping an output column on the SAP Data Services query transform mapping tab?

You source table has a revenue column and a quantity column for each month. You want to transform this data to get a table containing twelve rows whit two columns.
What is the best way to achieve this in SAP Data services?

You want to load data from an input table to an output table using the SAP Data Services Query transform. How do you define the mapping of the columns within a Query transform?

An SAP Data Services dataflow must load the source table data into a target table, but the column names are different. Where do you assigg each source column to the matching target column?

What can you use a workflow for in SAP Data Services?