小编Ant*_*tts的帖子

我正在尝试将多个外键添加到同一个表中；但是，不断弹出错误代码 1215：无法添加外键约束。我读过其他人关于同一主题的帖子并尝试添加 innodb，但错误仍然弹出。任何帮助表示赞赏！

这是我的代码：

Create Database if not exists Research;
Use Research;

Create table if not exists CompanyInfo
(
CID int primary key, Company varchar(45), 
SIC int, InnovativeIndex int
) 
engine = innodb;

Create table if not exists TimePeriod
(
Year int primary key, GDP int, GDPgrowth int, 
inflation decimal(5,2), unemployment decimal(5,2)
) 
engine = innodb;

Create Table If not exists CompanyRank 
(
CID int, Year int, IndexYN int, SPRank int, FortuneRank int, 
primary key (CID, Year), index (CID), Index(year), …