There are several reasons to denormalize data. The first is to improve performance by:
A . Creating smaller copies of fata to reduce costly run-time calculations and/or table scans of large tables.
B . None of the above
C . Pre-calculating and sorting costly data calculations to avoid runt-time system resource competition.
D . Making tables more readable when no foreign key exists
E . Combining data from multiple other tables in advance to avoid costly run-time joins
F . All of the above
Answer: A,C,E