Quite commonly in the applications you would need to use some kind of “status” field - status of order - “new”, “confirmed”, “in production”, “shipped” status of job, message etc. People use variety of ways to handle them often without giving enough thought to the choice which can cause problems later.For more details on this topic you find it on http://www.mysqlperformanceblog.com/2008/08/09/picking-datatype-for-status-feilds/
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