These sub queries are called derived tables or table expressions.
这些子查询被称作派生表或表表达式。
Under Sub-Category, click table, which refers to the outer table of users, not the inner table of work items.
在Sub - Category之下，点击Table，它会引用用户外层表格，而不是工作项的内层表格。
The work items may contain sub-work items; therefore the inner table should include an embedded inner table and link table.
工作项可能包含有子工作项；因此内部表格应该包含一个嵌入的内部表格和联系表格。
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