071-67q
1 choose the best answer
选择最好的答案
exanine the desciption of the employees table:
员工表的填写:
which query is valid?
哪个查询是有效的?
A) select dept_id, join_date, sum(salary) from employees group by dept_id, join_date;
通过dept_id, join_date从员工组中选择dept_id, join_date, sum(工资);
2 choose three
选择三个
which three are true about the create table command?
关于create table命令，哪三个是正确的?
A) it can include the create … index statement for creating an index to enforce the primary key constraint.
它可以包括create…用于创建执行主键约束的索引的索引语句。
B) the owner of the table s