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因为id列是表的主列，在它上面已经创建了关系索引。
Since the column id is the primary column for the table, there is already a relational index created on it.
具体的列，在扩展时，会直接显示在行的下面，该行包含了数据的主列。
The detail columns, when expanded, are displayed directly below the row that contains the primary columns of data.
在振型独立性的基础上，提出了一种基于主列筛选的传感器配置方法。
In the paper, a new sensor placement method is developed on the basis of mode independence and principal subset selection.
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