每隔一行显示一个竞争者，即，第1行拥有序列中的第一个seed，第3行拥有序列中的第二个seed，第5行拥有序列中的第三个seed，等等依此类推。
A competitor appears in every other row, which means row 1 has the first seed in the sequence, row 3 has the second seed in the sequence, row 5 has the third seed in the sequence, and so on.
查找以单词“users”开头的行，并使用组成员所需的属性名称替换其中的第三个字段。
Find the line that starts with the word "users", and replace the third field with the desired attribute name for group members.
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.
应用推荐