三个表用等值连接谓词连接。
事实表和任何维度表之间的连接都是等值连接，这使得散列连接成为可能。
The join between the fact table and any dimension table is an equi-join, which makes a hash join possible.
为了提高SQL的效率，尽可能的使用等值连接，没有列转换的语句更容易调整。
To improve SQL efficiency, use equijoins whenever possible. Statements that perform equijoins on untransformed column values are the easiest to tune.
在采用网格法追踪等值线时，如果某个网格四条边上都有等值点，等值点的连接就会出现多义性问题。
Assume that there is an equivalent node on each side of a grid when using gridding method to draw isoline, how to connect these nodes is ambiguous.
通过对站点资料的边界插值、三角形剖分等处理后，再在剖分出来的三角形网格中按照一定方式连接等值线即可实现等值线的自动分析。
The auto-drawing of contours was realized through interpolating on sides, triangulating, and then connecting the contours on the triangulated meshes in certain order.
一种连接厚度相等的各点的等值线。
一种连接厚度相等的各点的等值线。
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