sort and count

Methods To investigation the cases of 501 pilots who recuperate in our sanatorium on 1~ 10,2003, find 15 lumbar intervertebral discs, sort and count and compare them by airplane's type and pilots' age.

方法对2003年1～10月来我院疗养的501名飞行员的疗案进行调查，按飞行机种和飞行员年龄进行分类统计，并做比较。

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note that if several counting functions or tests operate on the same column, then the sort and count operations only need to be done once.

注意，如果多个计数函数或测试在同一列上运行，那么排序与计数操作仅需做一次。

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