目录一、连接简介1.1 连接的本质1.2 连接过程简介1.3 内连接和外连接1.4 左外连接1.5 右外连接1.6 内连接小结二、连接的原理2.1 嵌套循环连接（Nested-Loop Join）2.2 使用索引加快连接速度2.3 基于块的嵌套循环连接
I have a collection of objects which have several properties in each of them.I often need to get a list of distinct values for many properties in this collection. If I implement IEqualityComparer on t
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