Question

Error starting at line : 25 in command -
CREATE TABLE Note (
    Note_ID NUMBER,
    Engineer_ID NUMBER,
    Project_ID NUMBER,
    Bug_ID NUMBER,
    Bug_Name varchar2(30),
    CONSTRAINT Note_PK PRIMARY KEY (Note_ID),
    FOREIGN KEY (Engineer_ID) REFERENCES Engineer(Engineer_ID),
    FOREIGN KEY (Project_ID) REFERENCES Project(Project_ID),
    FOREIGN KEY (Bug_ID) REFERENCES Bug(Bug_ID),
    FOREIGN KEY (Bug_Name) REFERENCES Bug(Bug_Name)
)
Error report -
ORA-02270: no matching unique or primary key for this column-list
02270. 00000 -  "no matching unique or primary key for this column-list"
*Cause:    A REFERENCES clause in a CREATE/ALTER TABLE statement
           gives a column-list for which there is no matching unique or primary
           key constraint in the referenced table.
*Action:   Find the correct column names using the ALL_CONS_COLUMNS
           catalog view

似乎找不到解决此问题的方法...有人可以帮忙吗？很快需要分配作业。我事先有一些代码，但是我似乎无法找到任何问题：？

Answer 1

错误消息很清楚。对于表中定义的每个外键，被引用的表列必须为unique或primary key。

因此，您要确保以下所有表列均符合此要求：

Engineer(Engineer_ID)
Project(Project_ID)
Bug(Bug_ID)
Bug(Bug_Name)

同样，问题出在列Bug_Name上；我猜想此信息在功能上取决于Bug_ID，而该信息已被外键引用：如果是这样，则只需要将其存储在Note表中即可（您可以访问它）通过Bug_ID外键）。

Oracle没有与此列列表匹配的唯一或主键

1 个答案: