• 1. table-row-group: 表格行组
• 2. tbody table-row-group: 代表表格中的所有行

• 1.Each row of this table is a tuple consisting of the group name and user ID.
  这个表中的每一行是一个由组名和用户ID组成的二元组。
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• 2.Assuming there is at least one, each instance is described in a row of the table. The instance ID and AMI ID are displayed, along with the public DNS name, security group, and key pair.
  假设至少有一个实例，每个实例在一个表格行中描述，包括实例ID、A MI ID、公共dns名称、安全组和值对。
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• 3.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.
  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。
  dict.yoduao.com

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