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winfrom DataGridView Sql语句获取平均值写法
用sql语句实现如图结果该怎么做。 我把得到的数据放到了winform 的DataGridView控件里了。 重点是这个“平均”列,是在sql语句中获取该“区域”内所有“累计”的平均值。然后在绑定到DataGridView里面。 数据表如下:表R_Region 列 : 1 ID 区域ID Int 请教高手帮忙。
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