即它在一个唯一键组合上只会产生一行数据。
That is it only brings in one row of data for a unique key combination.
图1中的每一行数据由以下部分组成
前一个例子每次上载一行数据—显然不是最佳的方法。
The previous example uploaded the data one row at a time-obviously, not an optimal approach.
前一个例子每次上载一行数据—显然不是最佳的方法。
The previous example uploaded the data one row at a time-obviously, not an optimal approach.
应用推荐