第三个命令抽取 15% 的行,但是不收集分布统计信息,并对索引也应用了抽样,这不同于第一个命令和第二个命令。
The third command samples 15% of all rows, does not collect distribution statistics, and also applies sampling to indexes which the first and second commands didn't.
观察其模式,第2行使用第一个元素,第6行使用第二个该元素,第10行使用第三个该元素。
Looking for a pattern, row 2 USES the first element, row 6 USES the second, and row 10 USES the third.
第三个代码块(第 8-11 行)处理将文档作为文本写入输出流。
The third block of code (lines 8-11) handles writing the document to an output stream as text.
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