Question

I’m trying to create a table with a foreign key using SQL command but I keep getting this error

Invalid field definition 'CUS_CODE' in definition of index or relationship.

I’m using this command:

CREATE TABLE INVOICE(
INV_NUMBER      CHAR(5)     NOT NULL,
INV_DATE        DateTime    NOT NULL,
CONSTRAINT      INV_PK      PRIMARY KEY(INV_NUMBER),
CONSTRAINT      INV_FK      FOREIGN KEY(CUS_CODE) REFERENCES CUSTOMER(CUS_CODE)
);

Answer 1

It’s because Cus_code is not a field in your invoice table.

It should be :

FOREIGN KEY(Your column name in your invoice table) REFERENCES Customer(Cus_Code)

Here’s an tutorial about SQL FOREIGN KEY

It should help you to illustrate what it should looks like