访问路径图不但描述“操作细节”，而且描述数据如何流动。
An access path graph not only describes the "operational details" of query execution, it also describes how the data flows.
清单6中的sql语句创建如图6所示的访问路径图。
The SQL statement in Listing 6 creates the access path graph shown in Figure 6.
清单5中的sql语句创建如图5所示的访问路径图。
The SQL statement in Listing 5 creates the access path graph shown in Figure 5.
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