It seems to me that the while (unit of time) in time arithmetic is determined by the written program, and that one cannot vary it. In Access this is a character string (not that I recommend character string for this! but an enumerated type), and one can vary it: Datediff(Interval, When, Date()). MySQL s <file:///C:/Program%20Files/MySQL/MySQL%20Server%205.1/HELP/functions.html#function_date-sub>DATE_SUB(date,INTERVAL expr unit<file:///C:/Program%20Files/MySQL/MySQL%20Server%205.1/HELP/functions.html#function_date-sub>) takes two arguments, the lattar argument contains, o, say, INTERVAL 5 MONTH, and there is no varying "MONTH". Or is there?
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