oracle数据库删除用户(schema)操作
https://blog.csdn.net/weixin_34246551/article/details/92249494
https://blog.csdn.net/iteye_14947/article/details/82334205?utm_medium=distribute.pc_relevant.none-task-blog-2%7Edefault%7EBlogCommendFromMachineLearnPai2%7Edefault-3.control&depth_1-utm_source=distribute.pc_relevant.none-task-blog-2%7Edefault%7EBlogCommendFromMachineLearnPai2%7Edefault-3.control