The query optimizer might come up with a different query execution plan tailored to provide good performance for fast retrieval of first 'n' rows rather than all the result rows.

查询优化器可能得出一个不同的查询执行计划，这个计划可以专门为最快地获取前' N '行，而不是所有结果行提供良好的性能。

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Each import can read a different section of the same input file because the import command allows you to specify "SKIPCOUNT m ROWCOUNT n" to read rows m+1 to m+n from the input file.

每个导入命令可以读取一个输入文件的不同片段，因为导入命令允许指定 “SKIPCOUNT m ROWCOUNT n” 来读取输入文件中的 m+1 到 m+n 行。

youdao

The memory array includes M rows and N columns of memory cells and a column of dummy cells.

所述存 储器阵列包括M行和N列存储器单元以及列虚设单元。

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