此代码为利用PL/SQL开发数据库存储过程的典型示例，此为第4部分，希望大家可以通过该代码清楚如何利用SQL语句实现复杂的业务逻辑。-this code for the use of PL / SQL stored procedures development of the database of typical examples of this Part 4 We can hope that the adoption of the code clearly how to use SQL to achieve complex business logic.