You may find Node-Arc-Node relationships (triple) easier to understand than relational database models.

您会发现Node - Arc - Node关系(三元组)比关系数据库模型更易于理解。

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Find the top join node in a query plan.

查找一个查询计划中的顶级连接节点。

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You can then go through child nodes until you find the photo node.

然后，您可以遍历子节点，直至找到照片节点。

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To find the body's secret weapon, scientists remove cells from a lymph node - a part of the circulation system used by immune cells, but which also often forms a "staging post" for cancer as it spreads around the body.

BBC: Supercharged cells fired at skin cancer