摘要：
There is a kind of balanced binary search tree named red-black tree in the data structure. It has the following 5 properties: (1) Every node is either 阅读全文
摘要：
1 all previleges语法错误 2 3 二、数据库的安全性控制 4 1、存取控制 5 ①自主存取控制(DAC)(C2级) 6 [例1] 把查询Student表权限授给用户U1 7 grant select 8 on student 9 to u1 10 [例2] 把对Student表和Co 阅读全文