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在植保工作中,常需要对历史资料进行各种查询统计,比如求出历年某项资料的平均值,最大值或最小值等。如果手工计算,不但要翻阅历年的资料,操作起来十分不便,而且由于计算错误产生的偶然误差或因取资料的长度、计算方法不同而产生的系统误差也在所难免,使得计算结果可比性较差。
In plant protection work, it is often necessary to make various inquiries on historical data, for example, to find the average, maximum or minimum value of a certain data over the years. If the manual calculation, not only to flip through the calendar year data, the operation is very inconvenient, but also due to errors caused by accidental errors or take the length of the data, the calculation method is different from the system error is inevitable, making the comparability of the results compared difference.