回收用户U1,U2和U3在关系employee的salary属性上的UPDATE权限的语句是【 】UPDATE(salary) ON employee FROM Ul,U2,U3。
第1题:
回收用户U1,U2和U3在关系employee的salary属性上的UPDATE限的语句是
A.REVOKE UPDATE(salary) ON employee(U1,U2,U3)
B.REVOKE UPDATE(salary)ON employee FROM U1,U2,U3
C.REVOKE UPDATE ON employee FROM U1,U2,U3
D.REVOKE UPDATE(salary) FROM U1,U2,U3
第2题:
u1、u2、u3为同频率的正弦量,若u1超前u2,u2超前u3,则u1一定超前u3。
第3题:
20、若用户执行下述语句,则他需要___ 权限。 update sc set grade=60 where grade < 60
A.update
B.delete
C.update和select
D.update,select和insert
第4题:
Click the Exhibit button to examine the data of the EMPLOYEES table.Which statement lists the ID, name, and salary of the employee, and the ID and name of the employee‘s manager, for all the employees who have a manager and earn more than 4000?()
A.SELECT employee_id "Emp_id", emp_name "Employee", salary, employee_id "Mgr_id", emp_name "Manager" FROM employees WHERE salary > 4000;
B.SELECT e.employee_id "Emp_id", e.emp_name "Employee", e.salary, m.employee_id "Mgr_id", m.emp_name "Manager" FROM employees e JOIN employees m WHERE e.mgr_id = m.mgr_id AND e.salary > 4000;
C.SELECT e.employee_id "Emp_id", e.emp_name "Employee", e.salary, m.employee_id "Mgr_id", m.emp_name "Manager" FROM employees e JOIN employees m ON (e.mgr_id = m.employee_id) AND e.salary > 4000;
D.SELECT e.employee_id "Emp_id", e.emp_name "Employee", e.salary, m.mgr_id "Mgr_id", m.emp_name "Manager" FROM employees e SELF JOIN employees m WHERE e.mgr_id = m.employee_id AND e.salary > 4000;
E.SELECT e.employee_id "Emp_id", e.emp_name "Employee", e.salary, m.mgr_id "Mgr_id" m.emp_name "Manager" FROM employees e JOIN employees m USING (e.employee_id = m.employee_id) AND e.salary > 4000;
第5题:
9、若有3个用户U1、U2、U3,数据表R,则下列符合SQL的权限授予和回收的语句是()。
A.GRANT SELECT ON R TO U1
B.REVOKE UPDATE ON R TO U3
C.GRANT DELETE ON R TO U1,U2,U3
D.REVOKE INSERT ON R FROM U2