删除数据库账号user1的SQL语句是（）（关键字全部小写)

A.TRUNCATE

B.DROP

C.DELETE

D.ALTER

A.数据库一旦创建就不能被删除

B.在使用DROP DATABASE语句删除数据库时，如果要删除的数据库不存在，则删除会失败

C.成功删除数据库后，数据库中的所有数据都将被清除，但是原来分配的空间被释放

D.“DROP TABLE”语句是删除数据库的关键字

A.EXECUTE sp_addrolemember 'USER1','R1'

B.EXECUTE sp_addrolemember 'R1','USER1'

C.EXECUTE sp_addsrvrolemember 'USER1','R1'

D.EXECUTE sp_addsrvrolemember 'R1','USER1'

A.DELETE USER 'user1'@'localhost';

B.DROP USER 'user1'.’ocalhost';

C.DROP USER user1.localhost;

D.DROP USER 'user1'@'localhost';

A.GRANT 课程表 ON SELECT TO USER1 WITH GRANT OPTION

B.GRANT SELECT ON 课程表 TO USER1 WITH GRANT OPTION

C.GRANT USER1 ON 课程表 TO SELECT

D.GRANT SELECT ON USER1 TO 课程表

A.Drop DataBase Test

B.Delete DataBase Test

C.Alter DataBase Test

D.Delete From DataBase Test

A.DELETE DATABASE sales

B.DROP DATABASE sales

C.REMOVE DATABASE sales

D.ALTER DATABASE sales