SELECT class_date_start_time ,class_date_end_time, (UNIX_TIMESTAMP(class_date_end_time)-UNIX_TIMESTAMP(class_date_start_time))/60/60   FROM py_class_base


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SELECT start_time ,end_time, (UNIX_TIMESTAMP(end_time)-UNIX_TIMESTAMP(start_time))/60/60   FROM time_time




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