请注意，在查询10中多获得了一行，这是因为SQL的group by函数还为null值生成一个组，我们的示例表中有一名员工没有办公室信息。

Note that we get an extra row from Query 10, because SQL's group by also produces a group for NULL values, and there is one employee in our sample table with no office information.

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结果：30例中10例行保守治疗，20例行减压治疗，随访均未发生骨筋膜室后遗症。

Results: Among 30 patients, 10 patients with conservative treatment and 20 patients with fasciotomy, none of our 30 patients had any sequelae of the compartment syndrome.

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