12C OCP 1ZO-071 题库（8月以前）

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_i

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