Oracle 甲骨文：如何找到符合先决条件的学生

我是甲骨文的新手。如何找到符合先决条件的学生

SELECT
    c.course_no,
    c.description,
    c.prerequisite,
    level AS level_course,
    stu.student_id
FROM
    course c
    INNER JOIN section s ON c.course_no = s.course_no
    INNER JOIN enrollment e ON s.section_id = e.section_id
    INNER JOIN student stu ON e.student_id = stu.student_id
CONNECT BY
    PRIOR c.course_no = c.prerequisite

[1] ：课程表

[1] ：报名表分区表

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您可能需要在

连接方式

之前添加

开始

以20号课程为例

您可以删除

和c.course\u no=20

，查看所有课程

注意：还调整了列以使其更清晰

SELECT
    level AS level_course,
    c.course_no,
    e.section_id,
    c.prerequisite,
    c.description,
    stu.student_id
FROM
    course c
    INNER JOIN section s ON c.course_no = s.course_no
    INNER JOIN enrollment e ON s.section_id = e.section_id
    INNER JOIN student stu ON e.student_id = stu.student_id
START WITH c.prerequisite IS NULL AND c.course_no = 20
CONNECT BY
    PRIOR c.course_no = c.prerequisite

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如果没有足够的信息，我无法回答这个问题。您希望得到什么列和结果？