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Remarks regarding CSV import
Data formatting
When importing the format expected (per column) is the same as it would be # produced when exporting (see Column & cell format under # CSV export).
Columns may be permuted arbitrarily or left out completely (in that case # the column will be treated as if every cell contained within it was # empty).
Columns are identified based on their heading. # Thus column headings may not be modified or removed.
Edits
Some cells can be changed when importing.
Cells that cannot be changed are ignored, if they were changed.
Preview
Before any edits are applied a preview is shown of what would be done.
In the preview an arbitrary subset of edits may be selected for # application.
Empty cells
Cells which may be deleted are deleted or set to uniquely determined # values if the corresponding cell is empty during import.
Consistency

Only consistent edits are ever made!

Thus it can be useful to leave certain cells empty. # For example when changing the associated field of study for a course # participant one would have to change the degree and semester to match if # they are not left empty.
If they are left empty they are automatically filled in if their values # can be uniquely determined (which is usually the case).

Identification of rows
Multiple columns may be used to identify each row.
Thus not every cell used to identify a row needs to be filled, as long as # the row can still be uniquely identified.
If multiple columns used for identification are not empty their values # need to be consistent.
Adding rows
Additional rows may be added as long as sufficient information is # provided. # For example course participants may be added this way.
Deleting rows
Rows that are missing in the imported file are offered up for deletion # during the edit preview.