摘要：
-- 使用函数的方法：--建立 演示环境if object_id('tb_bookInfo') is not null drop table tb_bookInfogocreate table tb_bookInfo(number int,name varchar(10),type int)insert tb_bookInfoselect 1 ,'n1', 6 union allselect 2 ,'n2', 3if object_id('tb_bookType') is not null drop table tb_bookTy 阅读全文
