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现有多个表的设备，数据点为电能，需要统计所有设备的电能和，根据每日或其他时间段展示时段差，是否只能一个点一个点进行映射后相加，有无更简单的办法
如果这个表内的所有设备都有电能这个数据点，可以在表上配置计算节点进行运算，这样可以将所有设备的该点进行运算
