Question

我在创建表时遇到这些错误，它们在我取出外键时起作用。我对构建数据库相对较新，所以我可能会遗漏一些简单的

Create Table IF NOT EXISTS Classroom_Address_Mailing_Tbl (
ID int auto_increment primary key,                       
Street_Address varchar (25),
City varchar (25),
State_Abbr varchar (2),
Zipcode varchar (10)
);


Create Table IF NOT EXISTS Classroom_Address_Physical_Tbl (
ID int auto_increment primary key,
Street_Address varchar (25),
City varchar (25),
State_Abbr varchar (2),
Zipcode varchar (10) 
);

Create Table IF NOT EXISTS Classroom_Info_Tbl (
ID int auto_increment primary key,
School_Name varchar (25),
Classroom_Name_Offical varchar (25),
Classroom_URL varchar (25),
Classroom_Address_Physical_ID int,
Classroom_Address_Mailing_ID int,
foreign key (Classroom_Address_Mailing_ID) references 
Classroom_Address_Mailing_Tbl (ID) on delete cascade,
foreign key (Classroom_Address_Physical_ID) references 
Classroom_Address_Physical_Tbl (ID) on delete cascade,
);


Create Table IF NOT EXISTS Contact_Info_Tbl (
Classroom_ID int,
Contact_Name varchar (20),
Contact_Title varchar (20),
Contact_Email varchar (20),
Contact_Phone varchar (20),
foreign key (Classroom_ID) references 
Classroom_Info_Tbl (ID) on delete cascade
);

这些是我得到的错误：

错误1064（42000）：您的SQL语法有错误;检查与MySQL服务器版本对应的手册，以便在第7行的'）'附近使用正确的语法

ERROR 1005（HY000）：无法创建表'neClassCertForm.Contact_Info_Tbl'（错误号：150）

Answer 1

好的问题是创建表中的逗号

Classroom_Address_Physical_Tbl (ID) on delete cascade,

这打破了表创建。还要添加ENGINE = innodb以强制执行外键约束。

Create Table IF NOT EXISTS `Classroom_Address_Mailing_Tbl` (
ID int auto_increment primary key,                       
Street_Address varchar (25),
City varchar (25),
State_Abbr varchar (2),
Zipcode varchar (10)
)ENGINE=InnoDB;


Create Table IF NOT EXISTS `Classroom_Address_Physical_Tbl` (
ID int auto_increment primary key,
Street_Address varchar (25),
City varchar (25),
State_Abbr varchar (2),
Zipcode varchar (10) 
)ENGINE=InnoDB;

Create Table IF NOT EXISTS `Classroom_Info_Tbl` (
ID int auto_increment primary key,
School_Name varchar (25),
Classroom_Name_Offical varchar (25),
Classroom_URL varchar (25),
Classroom_Address_Physical_ID int,
Classroom_Address_Mailing_ID int,
foreign key (Classroom_Address_Mailing_ID) references 
Classroom_Address_Mailing_Tbl (ID) on delete cascade,
foreign key (Classroom_Address_Physical_ID) references 
Classroom_Address_Physical_Tbl (ID) on delete cascade
)ENGINE=InnoDB;


Create Table IF NOT EXISTS `Contact_Info_Tbl` (
Classroom_ID int,
Contact_Name varchar (20),
Contact_Title varchar (20),
Contact_Email varchar (20),
Contact_Phone varchar (20),
index ci (Classroom_ID),
foreign key (Classroom_ID) references 
Classroom_Info_Tbl (ID) on delete cascade
)ENGINE=InnoDB;

ERROR 1064（42000）＆amp;＆amp; ERROR 1005（HY000）：无法创建表Contact_Info_Tbl（错误号：150）

1 个答案: