Question

下面是我的架构，除了Assessment表之外一切都运行，我得到一个错误1215.无法添加外键约束。提前致谢。我还引用了其他表的主键作为评估表中的外键。

create database if not exists tcsdb;
use tcsdb;

create table if not exists Person (
PersonID int not null auto_increment,
ID varchar(10) not null unique,
FirstName varchar(45) not null,
LastName varchar(45) not null,
UserName varchar(45) not null unique,
Password varchar(45) not null,
Email varchar(45) not null,
ContactNo varchar(45) not null,
primary key(PersonID)
);

create table if not exists Role (
RoleID int not null auto_increment,
RoleTitle varchar(45),
RoleDescription varchar(45),
primary key(RoleID)
);

create table if not exists Semester (
SemesterID int not null auto_increment,
SemesterPeriod varchar(45),
SemesterYear date,
primary key(SemesterID)
);

create table if not exists Unit (

UnitID int not null auto_increment,
SemesterID int,
UnitCode varchar(10) not null unique,
UnitName varchar(45) not null unique,
UnitDescription varchar(45) not null unique,
foreign key(SemesterID) references Semester(SemesterID) on update cascade on delete        restrict,    
primary key(UnitID, SemesterID)

);

create table if not exists Team (

TeamID int not null auto_increment,
TeamCode varchar(45) not null unique,
TeamName varchar(45) not null,
primary key(TeamID)

);

create table if not exists Project (

ProjectID int not null auto_increment,
ProjectCode varchar(45) not null unique,
ProjectDescription varchar(45) not null,
primary key(ProjectID)

);

create table if not exists AssessmentType (
AssessmentTypeID int not null auto_increment,
AssessmentType varchar(45) not null unique,
primary key(AssessmentTypeID)
);



create table if not exists Assessment (

AssessmentID int not null auto_increment,
PersonID int,
UnitID int,
SemesterID int,
TeamID int ,
ProjectID int ,
AssessmentComments varchar(45) not null,
AssessmentDueDate date,
AssessmentDateSubmitted date,
AssessmentTypeID int,
foreign key(PersonID) references PersonUnit(PersonID) on update cascade on delete restrict, 
foreign key(UnitID) references PersonUnit(UnitID) on update cascade on delete restrict,     
foreign key(SemesterID) references PersonUnit(SemesterID) on update cascade on   delete restrict, 
foreign key(TeamID) references Team(TeamID) on update cascade on delete restrict, 
foreign key(ProjectID) references Project(ProjectID)on update cascade on delete restrict,
foreign key(AssessmentTypeID) references AssessmentType(AssessmentTypeID) on update cascade on delete restrict,
primary key(AssessmentID, PersonID, UnitID, SemesterID, TeamID, ProjectID,   AssessmentTypeID)
);


create table if not exists PersonRole (
PersonID int,
RoleID int,
primary key(PersonID, RoleID),
foreign key(PersonID) references Person(PersonID) on update cascade on delete restrict,
foreign key(RoleID) references Role(RoleID) on update cascade on delete restrict
);


create table if not exists PersonUnit (
PersonID int,
UnitID int,
SemesterID int,
foreign key(PersonID) references Person(PersonID) on update cascade on delete restrict,
foreign key(UnitID, SemesterID) references Unit(UnitID, SemesterID) on update cascade on delete restrict,
primary key(PersonID, UnitID, SemesterID)
);

以下是我为SemesterID，TeamID，ProjectID和AssessmentTypeID获取的错误：

在引用的表中找不到引用的索引列显示为表中的第一列或列类型引用的表与约束不匹配。请注意在使用＆gt; =创建的表中更改了ENUM和SET的内部存储类型 InnoDB-4.1.12以及旧表中的此类列表不能被新表中的此类列引用。

感谢任何帮助。

Answer 1

当您使用复合主键（即多列的键）创建外键时，您还应该创建外键复合。

create table if not exists Assessment (
AssessmentID int not null auto_increment,
PersonID int,
UnitID int,
SemesterID int,
TeamID int ,
ProjectID int ,
AssessmentComments varchar(45) not null,
AssessmentDueDate date,
AssessmentDateSubmitted date,
AssessmentTypeID int,
foreign key(PersonID,UnitID,SemesterID) references PersonUnit(PersonID,UnitID,SemesterID) on update cascade on delete restrict,
restrict, 
foreign key(TeamID) references Team(TeamID) on update cascade on delete restrict,
foreign key(ProjectID) references Project(ProjectID)on update cascade on delete restrict,
foreign key(AssessmentTypeID) references AssessmentType(AssessmentTypeID) on update cascade on delete restrict,
primary key(AssessmentID, PersonID, UnitID, SemesterID, TeamID, ProjectID,   AssessmentTypeID)
);

我在这里回答了一个非常相似的问题：SQL Can't create table (errno: 150)

错误代码1215 MySQL

1 个答案: