Oracle SQL Database error: "no matching unique or primary key for this column-list" - sql

Question

I'm trying to set up a database in Oracle sql developer, I've got these 3 tables.
I need the table "GuyAddress" to have 3 primary keys, which are all foreign keys as well. This is where I'm running into an error which I can't get my head around.
CREATE TABLE Guy
(
id NUMBER(10) PRIMARY KEY,
name VARCHAR(50)
);
CREATE TABLE Address
(
zipcode VARCHAR(6),
"number" NUMBER(10),
CONSTRAINT PK_Address PRIMARY KEY(zipcode, "number")
);
CREATE TABLE GuyAddress
(
Guy_id NUMBER(10),
Address_zipcode VARCHAR(6),
Address_number NUMBER(10),
CONSTRAINT FK_GuyAddress_Guy_id FOREIGN KEY(Guy_id) REFERENCES Guy(id),
CONSTRAINT FK_GuyAddress_Address_zipcode FOREIGN KEY(Address_zipcode) REFERENCES Address(zipcode),
CONSTRAINT FK_GuyAddress_Address_number FOREIGN KEY(Address_number) REFERENCES Address("number"),
CONSTRAINT PK_GuyAddress PRIMARY KEY(Guy_id, Address_zipcode, Address_number)
);
This is the error, hopefully someone can spot the mistake I made because I can't...
Error starting at line : 18 in command -
CREATE TABLE "GuyAddress"
(
Guy_id NUMBER(10),
Address_zipcode VARCHAR(6),
Address_number NUMBER(10),
CONSTRAINT FK_GuyAddress_Guy_id FOREIGN KEY(Guy_id) REFERENCES Guy(id),
CONSTRAINT FK_GuyAddress_Address_zipcode FOREIGN KEY(Address_zipcode) REFERENCES Address(zipcode),
CONSTRAINT FK_GuyAddress_Address_number FOREIGN KEY(Address_number) REFERENCES Address("number"),
CONSTRAINT PK_GuyAddress PRIMARY KEY(Guy_id, Address_zipcode, Address_number)
)
Error report -
SQL Error: ORA-02270: no matching unique or primary key for this column-list
02270. 00000 - "no matching unique or primary key for this column-list"
*Cause: A REFERENCES clause in a CREATE/ALTER TABLE statement
gives a column-list for which there is no matching unique or primary
key constraint in the referenced table.
*Action: Find the correct column names using the ALL_CONS_COLUMNS
catalog view
Thanks!

Answer 1

You don't need separate foreign keys for each column in the referenced table's primary key - you can have multiple columns in a foreign key, e.g.:
CREATE TABLE Guy
(
id NUMBER(10) PRIMARY KEY,
name VARCHAR(50)
);
CREATE TABLE Address
(
zipcode VARCHAR(6),
address_number NUMBER(10),
CONSTRAINT PK_Address PRIMARY KEY(zipcode, address_number)
);
CREATE TABLE GuyAddress
(
Guy_id NUMBER(10),
Address_zipcode VARCHAR(6),
Address_number NUMBER(10),
CONSTRAINT FK_GuyAddress_Guy_id FOREIGN KEY(Guy_id) REFERENCES Guy(id),
CONSTRAINT FK_GuyAddress_Address FOREIGN KEY(Address_zipcode, Address_number) REFERENCES Address(zipcode,address_number),
CONSTRAINT PK_GuyAddress PRIMARY KEY(Guy_id, Address_zipcode, Address_number)
);
Note that I've updated your address.number column to be address.address_number, as it's not recommended that you use a column based on a keyword. Using doublequotes to get around this (and also enforce case sensitivity) is not recommended either; you'll have to remember to use them every time you reference that column!
As an aside, I assume that your address table has other columns? Because as things stand, the address table is pointless and could be skipped!