Sql 修改选择查询以创建堆叠条形图

我有一个关于就业申请跟踪系统的查询，该系统显示每个学习计划中被安排和未安排的学生人数。即使查询返回所需的结果，我仍在努力用它创建一个顶点堆叠条形图

查询：

 SELECT programme_name,
           SUM(CASE WHEN (cv_approval_date IS NOT NULL AND application_status_id <> 7) OR
                         application_status_id  IS NULL
                    THEN 1 ELSE 0 END) as Unplaced,
           SUM(CASE WHEN (cv_approval_date IS NOT NULL AND application_status_id <> 7) OR
                         application_status_id  IS NULL
                    THEN 0 ELSE 1 END) as Placed
    FROM programme LEFT JOIN
         student USING (programme_id) LEFT JOIN
         application USING (student_id)
    GROUP BY programme_name;

该图应该看起来类似于此-x轴表示程序，y轴表示放置的学生数量，以及未放置的学生数量：

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我该怎么做呢？任何帮助都将不胜感激

在Apex中创建图表时，您可以单击“图表查询示例”，查看一些将使用该图表类型的示例查询

对于堆叠条形图，给出了以下示例：

SELECT NULL LINK,
       ENAME LABEL,
       SAL "Salary",
       COMM "Commission"
FROM   EMP
ORDER  BY ENAME

在您的情况下，我认为您希望查询呈现以下格式：

SELECT NULL LINK,
       programme_name AS LABEL,
       SUM(...) AS "Unplaced",
       SUM(...) AS "Placed"
FROM ...

SELECT NULL LINK,
       programme_name AS LABEL,
       SUM(...) AS "Unplaced",
       SUM(...) AS "Placed"
FROM ...