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Time and date calculations

What's the format to do time and date calculations; for example, the number of hours and minutes between two time values?

The answer depends too much on which database you're using. Standard SQL provides for an INTERVAL data type, but apparently only Oracle implements it (and I have not experimented with it).

More typical is that you will want to use whatever date functions may be supplied by your database, such as DATEADD() and DATEDIFF(). If you have a problem with a specific SQL query, please ask another question and mention which database you're using.

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