Finding simultaneous events in a database between times

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Published on 2010-06-15T11:42:40Z Indexed on 2010/06/15 11:52 UTC
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I have a database that stores phone call records. Each phone call record has a start time and an end time. I want to find out what is the maximum amount of phone calls that are simultaneously happening in order to know if we have exceed the amount of available phone lines in our phone bank. How could I go about solving this problem?

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