In common data query, using the virtual table, the syntax analysis tree and memory database to realize common data query; by copying, moving, and divided the branch from virtual SQL query syntax tree to make the query optimized. 在小数据查询方而,利用虚拟表、语法分析树和内存数据库实现小数据查询,通过复制、移动和分割虚拟SQL查询语法树分支进行优化。