发布时间：2014-12-16 13:07:45
最近在看PG query planner部分的代码相对于mysql的代码, postgres代码的可读性很高大致画了下这部分的流程图, 辅助理解代码......【阅读全文】
发布时间：2014-12-02 16:49:08
一、Oracle的schemaA schema is a collection of database objects (used by a user.). Schema objects are the logical structures that directly refer to the database’s data.A user is a name defined in the database that can connect to and access objects.Schemas and users help database administrators.........【阅读全文】
