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2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 2, We can hope that the adoption of the code clearly how to use SQL to achieve complex business logic.