Just think of each row in your table as potentially having column data, as well as optionally having child nodes.
您表中的每行可能有列数据，也可能有子节点。
To illustrate this, compare it to the predicate that is applied to the index scan numbered 5 in the plan, which is on the one and only column of the index on the child table.
为了展示这一点，将它与计划中第5号索引扫描上使用的谓词相比较，它针对子表中惟一的索引列。
The table column headers are defined by listheader child components of the customerList listbox.
表格列标题由customerlist列表框的子部件listheader来定义。
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