R树索引树的代码,用于空间数据库索引，是先进比较流行的数据库索引算法-R-tree index tree code, the index for spatial databases, advanced database indexing algorithm more popular

SQL server2008空间索引概述，简单易学，本为非传阅资料-SQL server2008 Spatial Indexing Overview, easy to learn, the non-circulation of information

索引种类: -普通索引 -唯一索引 -主键索引 -符合索引 -全文索引 -空间索引(Index types: - common index - unique index Primary key index - conforming to index - full text index - spatial index)