Discussion
To update an SQL view, the DBMS must be able to associate the column(s) to be updated with:
Answer: C
Correct answer: a particular row in a particular underlying table.
To apply an update the DBMS must know which row of which base table the change belongs to, and that is possible only if the view carries the key and the column maps to a single stored column. Where a view aggregates, joins ambiguously or computes a column, no such row exists and the update cannot be performed.
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