下面选项中,用于在删除存储过程时,检测存储过程是否存在的关键字是
A. IF EXISTS
B. HAS EXISTS
C. AS EXISTS
D. IS EXISTS
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下面声明一个名为cursor_student的游标,语法格式正确的是
A. CURSOR cursor_student OF select s_name,s_gender FROM student;
B. CURSOR cursor_student FOR select s_name,s_gender FROM student;
C. DECLARE cursor_student CURSOR FOR select s_name,s_gender FROM student;
DECLARE cursor_student CURSOR OF select s_name,s_gender FROM student;
MySQL中,预设的拥有最高权限的超级用户的用户名为()
A. test
B. administrator
C. DBA
D. root
影响计算机系统安全的因素包括( )
A. 计算机病毒
B. 系统故障的风险
C. 内部人员道德风险
D. 以上都是
下面使用DROP USER语句删除用户user1的语句中,正确的是()
A. DELETE USER 'user1'@'localhost';
B. DROP USER 'user1'.’ocalhost';
C. DROP USER user1.localhost;
DROP USER 'user1'@'localhost';
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