Question

这是我今年的甲骨文家庭作业的最后一个问题，我无法弄清楚哪里开始..必须是一个糟糕的大脑日。

有人可以帮我这个吗？

使用WITH子句编写SELECT语句以列出那些最高工资超过整个公司最高工资一半的工作的job_title。将子查询命名为MAX_CALC_SAL。命名结果JOB_TITLE和JOB_TOTAL中的列，并按JOB_TOTAL的降序对结果进行排序。提示：检查作业表。您需要加入JOBS和EMPLOYEES才能显示job_title。

谢谢！

这就是我到目前为止......

WITH MAX_CALC_SAL  AS (
    SELECT e.salary, SUM(e.salary) AS tot_salary
    FROM   employees e JOIN jobs j
    ON     e.job_id = j.job_title
    GROUP BY j.job_title
),
avg_cost AS (
    SELECT SUM(e.salary)/COUNT(*) AS avg_salary
    FROM   e.employee
)
SELECT * 
FROM   e.employee 
WHERE  avg_salary > (SELECT max_salary / 2 
                     FROM j.jobs)
ORDER BY job_total

Answer 1

您正在寻找类似的东西：

WITH max_calc_sal
  AS (SELECT job_id,
             j.job_title,
             MAX(e.salary) AS job_total
        FROM jobs j
       INNER JOIN employees e
       USING (job_id)
       GROUP BY job_id,
                j.job_title)
SELECT job_title,
       job_total
  FROM max_calc_sal
 WHERE job_total > (0.5 * SELECT MAX(job_total)
                            FROM max_calc_sal)
 ORDER BY job_total DESC;

Answer 2

使用WITH子句定义的名称不会自动出现在您的最终查询中。它们像派生表一样工作，因此您必须从中选择或加入它们才能获取数据。

WITH my_with_table AS (SELECT 9 AS X FROM DUAL)
SELECT X FROM my_with_table;

Oracle的功课 - 我很难过

2 个答案: