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I am trying to calculate the running sum of the time difference and group it by date of the equipment used. sample table: ID Date In Out 1 15Oct10 10:15 11:05 2 15Oct10 11:45 12:05 3 17Oct10 12:45 13:00 4 19Oct10 2:50 3:00 5 20Oct10 23:05 2:05 Sample query: ID Date...