单项选择题
A.It allows a grantee DBA privileges.
B.It is required syntax for object privileges.
C.It allows privileges on specified columns of tables.
D.It is used to grant an object privilege on a foreign key column.
E.It allows the grantee to grant object privileges to other users and roles.
单项选择题 The EMP table has these columns: Management wants a list of names of employees who have been with the company for more than five years. Which SQL statement displays the required results?（）
单项选择题 Which constraint can be defines only at the column level?（）
单项选择题 In which scenario would TOP N analysis be the best solution?（）