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“database classes”, what does it mean? Just like "csci_6___"? what about csci 7000?
drjohn is right, and savalan85 is right too. If you have a large numbers of records(e.g. more than 500,000), or query it very frequently, go with savalan85; otherwise you should go with drjohn.
hericles and drjohn had said what I want to say. You should not store the "countdown number", on the other hand, you should count it when you use it. e.g. When you want to known "how many people are in active"
The End.