说明：  数据库简介，WORD版本。包括SQL语句，字段属性，数据库高级操作，连接查询，视图，备份与还原，事务安全，触发器、函数和存储过程
(Database introduction, word version. It includes SQL statements, field properties, database advanced operations, connection query, view, backup and restore, transaction security, triggers, functions and stored procedures)