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Error Code: 1239. Incorrect foreign key definition for 'foreign key without name': reference and table don't match

Error 1239: Incorrect foreign key definitionAre two indexes needed?How implement MySQL unique index with two foreign key that one can be null?Finding rows for a specified date rangeSimple query is slow on 4M-rows tableMySQL : Avoid Temporary/Filesort Caused by GROUP BY Clause in ViewsDon't know why MySQL is not creating table with primary key constraintone to many relationship DB structureINSERT gives Error Code: 1366. Incorrect string value: 'xF0x9Fx98x80' for columnError 1239: Incorrect foreign key definitionJoining mysql tables

0

Im making a new database which after making the Department Table I receive an error when adding other tables.

CREATE TABLE Department (dept_name varchar(20), building varchar(15), budget numeric(12,2), primary key(dept_name));

CREATE TABLE Course (course_id varchar(7), title varchar(50), dept_name varchar(20),credits numeric(2,0), primary key(course_id),
foreign key(dept_name) references Department);

CREATE TABLE Instructor (ID varchar (5),name varchar (20) not null,dept_name varchar (20),salary numeric (8,2),primary key (ID),
foreign key (dept_name) references Department);

i had a look at Error 1239: Incorrect foreign key definition but didn't seem to help.

mysql dbms

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Chaos OrderChaos Order

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Im making a new database which after making the Department Table I receive an error when adding other tables.

CREATE TABLE Department (dept_name varchar(20), building varchar(15), budget numeric(12,2), primary key(dept_name));

CREATE TABLE Course (course_id varchar(7), title varchar(50), dept_name varchar(20),credits numeric(2,0), primary key(course_id),
foreign key(dept_name) references Department);

CREATE TABLE Instructor (ID varchar (5),name varchar (20) not null,dept_name varchar (20),salary numeric (8,2),primary key (ID),
foreign key (dept_name) references Department);

i had a look at Error 1239: Incorrect foreign key definition but didn't seem to help.

mysql dbms

share

asked 2 mins ago

Chaos OrderChaos Order

1

New contributor

Chaos Order is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

add a comment | 

Im making a new database which after making the Department Table I receive an error when adding other tables.

CREATE TABLE Department (dept_name varchar(20), building varchar(15), budget numeric(12,2), primary key(dept_name));

CREATE TABLE Course (course_id varchar(7), title varchar(50), dept_name varchar(20),credits numeric(2,0), primary key(course_id),
foreign key(dept_name) references Department);

CREATE TABLE Instructor (ID varchar (5),name varchar (20) not null,dept_name varchar (20),salary numeric (8,2),primary key (ID),
foreign key (dept_name) references Department);

i had a look at Error 1239: Incorrect foreign key definition but didn't seem to help.

mysql dbms

share

asked 2 mins ago

Chaos OrderChaos Order

1

New contributor

Chaos Order is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share

asked 2 mins ago

Chaos OrderChaos Order

1

New contributor

Chaos Order is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share

asked 2 mins ago

Chaos OrderChaos Order

1

New contributor

Chaos Order is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked 2 mins ago

Chaos OrderChaos Order

1

New contributor

Chaos Order is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked 2 mins ago

Chaos OrderChaos Order

1