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一个表到另外一个表有没有通路，决定了能否进行过滤聚合，所以我们经常需要查看两个表之间是否存在相通的路径。
当模型中数据表较多或者关系比较比较复杂时，难免会不易查看表与表之间的路径是否相通。
比如我们想要使用下图中的 language 过滤 payment，直接看的话可能需要按照路径一步一步的寻找路径。
此时我们可以使用模型设计器中的标记功能，将起点打上标记，再设置终点。这样可以快速查找相通的路径，如不通则会提示路径不通。
首先单击起点的表，然后标记为路径起点。
然后单击终点表，标记为路径终点。
如此，我们就可以快速得到两个表之间的路径，查看经过了哪几个表。
如果两个表之间没有相通的路径，则会报错提醒。
