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Bogus foreign key constraint fail
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Closed 6 years ago.
I'm getting the error: Error 1217 in my MySQL code. My MySQL code is
DROP TABLE IF EXISTS Formed;
DROP TABLE IF EXISTS Album;
DROP TABLE IF EXISTS Band;
DROP TABLE IF EXISTS Customers;
DROP TABLE IF EXISTS Track;
CREATE TABLE Formed(
FormedID int AUTO_INCREMENT,
YearFormed int,
CountryFormed varchar(50),
CityFormed varchar(50),
BandMembers varchar(400),
PRIMARY KEY(FormedID))
ENGINE=InnoDB;
CREATE TABLE Track (
TrackID int AUTO_INCREMENT,
AlbumID int AUTO_INCREMENT,
Songs varchar (100),
TrackNumber varchar (20),
Title varchar (30),
TrackDuration varchar (4),
PRIMARY KEY (TrackID))
ENGINE=InnoDB;
CREATE TABLE Album(
AlbumID int AUTO_INCREMENT,
TrackID int AUTO_INCREMENT,
BandID int AUTO_INCREMENT,
KEY(TrackID),
KEY(BandID),
Price varchar(5),
PublicationDate varchar(11),
Title varchar(30),
Genre varchar (36),
PRIMARY KEY(AlbumID))
ENGINE=InnoDB;
CREATE TABLE Band(
BandID int AUTO_INCREMENT,
AlbumID int AUTO_INCREMENT,
KEY(AlbumID),
RecordLabel varchar(50),
PRIMARY KEY(BandID))
ENGINE=InnoDB;
CREATE TABLE Customers (
CustomerID int AUTO_INCREMENT,
CName varchar (20),
CPhone int (11),
CEmail varchar (50),
CPPaid varchar (50),
CPDate date,
PRIMARY KEY (CustomerID))
ENGINE=InnoDB;
ALTER TABLE Track
ADD FOREIGN KEY (AlbumID) REFERENCES Album(AlbumID)ON DELETE SET NULL ON UPDATE CASCADE;
ALTER TABLE Album
ADD FOREIGN KEY (TrackID) REFERENCES Track(TrackID)ON DELETE SET NULL ON UPDATE CASCADE;
ALTER TABLE Album
ADD FOREIGN KEY (BandID) REFERENCES Band(BandID)ON DELETE SET NULL ON UPDATE CASCADE;
ALTER TABLE Band
ADD FOREIGN KEY (AlbumID) REFERENCES Album(AlbumID)ON DELETE SET NULL ON UPDATE CASCADE;
And I'm getting the error DROP TABLE IF EXISTS Album Error Code: 1217. Cannot delete or update a parent row: a foreign key constraint fails, it also happens for the other DROP TABLE IF EXISTS lines. I'm new to using Foreign Keys in MySQL scripts and I don't know why I'm getting these errors. If anyone could help me fix this, it would be appreciated. I've already tried all the answers that can be found by following this link Bogus foreign key constraint fail
Your Script is OK, but before Dropping Tables, try to remove the Foreign Key References
Related
I keep getting this error, I used InnoDB for all tables, menuID, and customerID, are primary keys in their respective tables, and the datatypes appear to be the same.
ERROR 1215 (HY000): Cannot add foreign key constraint
Sorry if I am missing something simple, I am new to mySQL.
create table customers(
customerID int not null auto_increment primary key,
LastName varchar(255) not null,
FirstName varchar(255) not null,
email varchar(255) not null,
password varchar(255),
phone varchar(255),
creditCard varchar(255),
address varchar(255),
time timestamp)
Engine=InnoDB;
create table menu(
menuID int not null auto_increment primary key,
typeID int,
itemName varchar(255),
price varchar(255))
Engine=InnoDB;
create table orders(
orderID int not null,
customerID int not null,
menuID int not null,
PRIMARY KEY (orderID, customerID, menuID),
FOREIGN KEY (customerID) REFERENCES customers(customerID) on delete set null on update cascade,
foreign key (menuID) references menu(menuID) on delete set null on update cascade )
Engine=InnoDB;
You can't use ON DELETE SET NULL for a foreign key column that you declared NOT NULL.
See this answer for a long checklist of things to check as possible causes of foreign key errors: MySQL Creating tables with Foreign Keys giving errno: 150
So I don't know why i cant add the foreign constraint in the table ORDER_LINE, i made sure all the types are correct. Please help, it keeps on giving me the error
Error Code: 1215. Cannot add foreign key constraint
CREATE TABLE IF NOT EXISTS Customer (
Customer_ID int NOT NULL AUTO_INCREMENT,
Customer_Name VARCHAR(50) NOT NULL,
Customer_Age INT UNIQUE,
Customer_Address VARCHAR(255),
Customer_City VARCHAR(255),
Customer_State VARCHAR(50),
Customer_Zip VARCHAR(20),
PRIMARY KEY(Customer_ID)
);
CREATE TABLE IF NOT EXISTS Sales_order (
Order_ID int AUTO_INCREMENT,
Order_date DATE,
Customer_ID int,
PRIMARY KEY(Order_ID),
FOREIGN KEY(Customer_ID) REFERENCES Customer(Customer_ID) ON DELETE
CASCADE
);
CREATE TABLE IF NOT EXISTS Products (
Product_ID int AUTO_INCREMENT,
Product_Description VARCHAR(255),
Product_Finish VARCHAR(50),
Standard_Price DECIMAL,
Product_Line_ID INT,
PRIMARY KEY(Product_ID)
);
CREATE TABLE IF NOT EXISTS ORDER_LINE (
Order_ID int,
Product_ID int,
Ordered_Quantity int,
PRIMARY KEY(Order_ID, Product_ID),
FOREIGN KEY(Order_ID) REFERENCES Sales_order(Order_ID) ON DELETE SET NULL,
FOREIGN KEY(Product_ID) REFERENCES Products(Product_ID)
);
This might be because primary key columns are made NOT NULL, so your ON DELETE SET NULL is trying to set an invalid value.
EDIT: In fact, I just tested and that does seem to be the issue -- it creates the table if I remove either the SET NULL or the primary key.
I'm getting an error when adding Foreign Keys to the system, the error says Cannot add foreign key constraint and the code that I have is:
DROP TABLE IF EXISTS Formed;
DROP TABLE IF EXISTS Album;
DROP TABLE IF EXISTS Band;
DROP TABLE IF EXISTS Customers;
DROP TABLE IF EXISTS Track;
CREATE TABLE Formed(
FormedID int NOT NULL,
YearFormed int,
CountryFormed varchar(50),
CityFormed varchar(50),
BandMembers varchar(400),
PRIMARY KEY(FormedID))
ENGINE=InnoDB;
CREATE TABLE Track (
TrackID int NOT NULL,
AlbumID int NOT NULL,
Songs varchar (100),
TrackNumber varchar (20),
Title varchar (30),
TrackDuration varchar (4),
PRIMARY KEY (TrackID))
ENGINE=InnoDB;
CREATE TABLE Album(
AlbumID int NOT NULL,
TrackID int NOT NULL,
BandID int NOT NULL,
KEY(TrackID),
KEY(BandID),
Price varchar(5),
PublicationDate varchar(11),
Title varchar(30),
Genre varchar (36),
PRIMARY KEY(AlbumID))
ENGINE=InnoDB;
CREATE TABLE Band(
BandID int NOT NULL,
AlbumID int NOT NULL,
KEY(AlbumID),
RecordLabel varchar(50),
PRIMARY KEY(BandID))
ENGINE=InnoDB;
CREATE TABLE Customers (
CustomerID int NOT NULL,
CName varchar (20),
CPhone int (11),
CEmail varchar (50),
CPPaid varchar (50),
CPDate date,
PRIMARY KEY (CustomerID))
ENGINE=InnoDB;
ALTER TABLE Track
ADD FOREIGN KEY (AlbumID) REFERENCES Album(AlbumID)ON DELETE SET NULL ON UPDATE CASCADE;
ALTER TABLE Album
ADD FOREIGN KEY (TrackID) REFERENCES Track(TrackID)ON DELETE SET NULL ON UPDATE CASCADE;
ALTER TABLE Album
ADD FOREIGN KEY (BandID) REFERENCES Band(BandID)ON DELETE SET NULL ON UPDATE CASCADE;
ALTER TABLE Band
ADD FOREIGN KEY (AlbumID) REFERENCES Album(AlbumID)ON DELETE SET NULL ON UPDATE CASCADE;
I'm new to adding Foreign Keys into MySQL and I don't understand how I'm getting this error. I'm getting the error when it hits the line ALTER TABLE Track
ADD FOREIGN KEY (AlbumID) REFERENCES Album(AlbumID)ON DELETE SET NULL ON UPDATE CASCADE; and I believe it will create the same error for the lines that come after it too.
You cannot provide ON DELETE SET NULL for non-nullable fields.
I'm getting an ERROR 1064 (42000) at line 21, which is VIN_Number in Vehicle table. Entity Inventory gets built without a problem, VIN_Number is of type varchar(17) for all occurrences. I believe the tables are being built in the correct order. I can't find any spelling or punctuation errors. I'm out of ideas of things I should checked. What is it that I'm missing?
Note: I getting an error for Invoice as well, but I know that it can't be created until Vehicle gets created.
ALTER TABLE Vehicle DROP FOREIGN KEY fk_Veh_Vehicle_TypeID;
ALTER TABLE Inventory DROP FOREIGN KEY fk_Inv_Vehicle_TypeID;
ALTER TABLE Invoice DROP FOREIGN KEY fk_Customer_ID;
ALTER TABLE Invoice DROP FOREIGN KEY fk_Sales_Person_ID;
ALTER TABLE Invoice DROP FOREIGN KEY fk_VIN_Number;
DROP TABLE IF EXISTS Vehicle, VehicleType,
Invoice, Customer, SalesPerson, Inventory;
CREATE TABLE VehicleType (
Vehicle_TypeID int NOT NULL,
Veh_Make varchar(15),
Veh_Model varchar(15),
Veh_Year int,
PRIMARY KEY (Vehicle_TypeID)
) Engine=InnoDB;
CREATE TABLE Vehicle (
VIN_Number varchar(17) NOT NULL,
Vehicle_TypeID int NOT NULL,
Condition varchar(10),
Color varchar(8),
PRIMARY KEY (VIN_Number),
CONSTRAINT fk_Veh_Vehicle_TypeID FOREIGN KEY(Vehicle_TypeID)
REFERENCES VehicleType(Vehicle_TypeID)
) Engine=InnoDB;
CREATE TABLE Inventory (
Stock_ID int NOT NULL,
Vehicle_TypeID int NOT NULL,
Quantity int,
PRIMARY KEY (Stock_ID),
CONSTRAINT fk_Inv_Vehicle_TypeID FOREIGN KEY (Vehicle_TypeID)
REFERENCES VehicleType(Vehicle_TypeID)
) Engine=InnoDB;
CREATE TABLE Customer (
Customer_ID varchar(10) NOT NULL,
Cus_LastName varchar(15),
Cus_FirstName varchar(15),
Cus_Street varchar(20),
Cus_City varchar(15),
Cus_Zip varchar(5),
Cus_Phone varchar(10),
PRIMARY KEY (Customer_ID)
) Engine=InnoDB;
CREATE TABLE SalesPerson (
Sales_Person_ID varchar(10) NOT NULL,
Sal_LastName varchar(15),
Sal_FirstName varchar(15),
Sal_Street varchar(15),
Sal_City varchar(15),
Sal_Zip varchar(5),
Sal_Phone varchar(10),
Sal_Years_Worked int,
Sal_Commission_Rate float(4),
PRIMARY KEY (Sales_Person_ID)
) Engine=InnoDB;
CREATE TABLE Invoice (
Invoice_ID varchar(10) NOT NULL,
Customer_ID varchar(10) NOT NULL,
Sales_Person_ID varchar(10) NOT NULL,
VIN_Number varchar(17) NOT NULL,
Price float(10),
PRIMARY KEY (Invoice_ID),
CONSTRAINT fk_Customer_ID FOREIGN KEY (Customer_ID)
REFERENCES Customer(Customer_ID),
CONSTRAINT fk_Sales_Person_ID FOREIGN KEY (Sales_Person_ID)
REFERENCES SalesPerson(Sales_Person_ID),
CONSTRAINT fk_VIN_Number FOREIGN KEY (VIN_Number)
REFERENCES Vehicle(VIN_Number)
) Engine=InnoDB;
In the definition of the Vehicle table you have a column named condition which is a reserved keyword in MySQL (reference). Either use another name for the column or enclose it in backticks like this: `condition`
Using keywords (reserved or not) for object names is generally something you want to avoid.
I am creating several tables at once and I keep getting the error(150):
#1005 - Can't create table 'waget.tour' (errno: 150)
and despite me knowing what the error is, I simply can't fix it. All tables references in the table "tour" are all there and exist, with keys where Foreign keys are referenced. I've checked it over plenty of times, and simply can't find anything. Can anyone see what I am doing wrong?
(Getting error when creating the table "tours")
CREATE TABLE IF NOT EXISTS tourPayment(
tourPaymentNumber int,
tourCost int(7),
PRIMARY KEY (tourPaymentNumber),
KEY (tourCost)
);
CREATE TABLE IF NOT EXISTS hotel(
hotelID int AUTO_INCREMENT,
hotelName varchar(30),
PRIMARY KEY (hotelID),
KEY (hotelName)
);
CREATE TABLE IF NOT EXISTS salutation(
salutationID int AUTO_INCREMENT,
salutation varchar(4),
KEY (salutation)
);
CREATE TABLE IF NOT EXISTS customer(
custID int AUTO_INCREMENT,
custSalutation varchar(4),
custLname varchar(30),
custAdd varchar(100),
custPcode varchar(4),
custState varChar(20),
custPhone varchar(10),
custHotel varchar(30),
PRIMARY KEY (custID),
FOREIGN KEY (custHotel) REFERENCES hotel(hotelName),
FOREIGN KEY (custSalutation) REFERENCES salutation(salutation)
);
CREATE TABLE IF NOT EXISTS bus(
busID int AUTO_INCREMENT,
busMake varchar(30),
busSeats varchar(3),
PRIMARY KEY (busID)
);
CREATE TABLE IF NOT EXISTS busDriver(
driverID int AUTO_INCREMENT,
driverName varchar(20),
driverEmail varchar(40),
busID int,
PRIMARY KEY (driverID),
FOREIGN KEY (busID) REFERENCES bus(busID)
);
CREATE TABLE IF NOT EXISTS tour(
DailyTourID int AUTO_INCREMENT,
NoOfPeople int(3),
tourDate DATE,
tourTime TIME,
tourName varchar(30),
tourCost int(7),
tourDriverID varchar(20),
PRIMARY KEY (DailyTourID),
FOREIGN KEY (tourDriverID) REFERENCES busDriver(driverID),
FOREIGN KEY (tourCost) REFERENCES tourPayment(tourCost)
);
CREATE TABLE IF NOT EXISTS TourCustLink(
TourCustLinkID int AUTO_INCREMENT,
TourID int,
custID int,
PRIMARY KEY (TourCustLinkID),
FOREIGN KEY (TourID) REFERENCES tour(DailyTourID),
FOREIGN KEY (custID) REFERENCES customer(custID)
);
Here is your problem:
FOREIGN KEY (tourDriverID) REFERENCES busDriver(driverID)
references an INT but is declared as varchar(20)
AUTO_INCREMENT fields all need to be PRIMARY KEY's, so try changing salutation to be
CREATE TABLE IF NOT EXISTS salutation(
salutationID int AUTO_INCREMENT,
salutation varchar(4),
PRIMARY KEY (salutationID),
KEY (salutation)
);
Additionally in tour you have the wrong datatype for tourDriverID, it should be INT to match the referenced key
CREATE TABLE IF NOT EXISTS tour(
DailyTourID int AUTO_INCREMENT,
NoOfPeople int(3),
tourDate DATE,
tourTime TIME,
tourName varchar(30),
tourCost int(7),
tourDriverID INT,
PRIMARY KEY (DailyTourID),
FOREIGN KEY (tourDriverID) REFERENCES busDriver(driverID),
FOREIGN KEY (tourCost) REFERENCES tourPayment(tourCost)
);
SQL fiddle example in full can be found here : http://sqlfiddle.com/#!2/840b9
Actually it's easy to try and create tables one by one and you would get a better error message..
Your Problem is the table salutation since you have to define the AUTO_INCREMENT field (in your case salutationID) as KEY and not the fieldsalutation`
CREATE TABLE IF NOT EXISTS salutation(
salutationID int AUTO_INCREMENT,
salutation varchar(4),
KEY (salutationID) -- here is your error
);
Is this the code you ran? if so, the error is about the AUTO_INCREMENT needing to be a Key.
CREATE TABLE IF NOT EXISTS salutation(
salutationID int AUTO_INCREMENT,
salutation varchar(4),
KEY (salutation)
);
Try:
CREATE TABLE IF NOT EXISTS salutation(
salutationID int AUTO_INCREMENT,
salutation varchar(4),
KEY (salutationID)
);
and make other a FOREIGN KEY if you need to.
Cheers.