> There just seems to be times when non-normalized table structures are
> to work with.
There are times when de-normalizing is acceptable. One of the more common
uses of denormalized data is in data warehousing. Such as pre-summing
sales, and storing pre-calculated aggregate information to relieve the db of
doing heavy or complex calculations when summary data is going to be queried
on a frequent basis.
Often php-based message boards will use columns of pre-sumed data as part of
a "normal" table (for example, a count of total user posts stored in the
user table, that is incremented/decremented when a user adds/deletes a post,
or the total number posts in a given thread stored in the topic table).
This helps to allieviate the need for a count() whenever a message thread is
built and you want to show the number of posts each user in the thread has,
So there are some acceptable situations :)
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