Error 00904 trying to alter table ... ?!

Question

I'm running a script to create a table, the primary key of that table will then be used in an Alter Table command to make it a foreign key in an already exisiting table. Code:
CREATE TABLE Category
CATCODE VARCHAR2(3),
CatDesc VARCHAR2(11) NOT NULL,
CONSTRAINT Category_CATCODE_pk PRIMARY KEY(CATCODE)
INSERT INTO Category(CATCODE, CatDesc) VALUES('BUS','Business');
INSERT INTO Category(CATCODE, CatDesc) VALUES('CHN','Children');
INSERT INTO Category(CATCODE, CatDesc) VALUES('COK','Cooking');
INSERT INTO Category(CATCODE, CatDesc) VALUES('COM','Computer');
INSERT INTO Category(CATCODE, CatDesc) VALUES('FAL','Family Life');
INSERT INTO Category(CATCODE, CatDesc) VALUES('FIT','Fitness');
INSERT INTO Category(CATCODE, CatDesc) VALUES('SEH','Self Help');
INSERT INTO Category(CATCODE, CatDesc) VALUES('LIT','Literature');
ALTER TABLE books ADD CONSTRAINT books_Category_fk FOREIGN KEY (CATCODE) REFERENCES Category(CATCODE);
And the error:
Error starting at line 20 in command:
ALTER TABLE books ADD CONSTRAINT books_Category_fk FOREIGN KEY (CATCODE) REFERENCES Category(CATCODE)
Error report:
SQL Error: ORA-00904: "CATCODE": invalid identifier
00904. 00000 - "%s: invalid identifier"
*Cause:
*Action:
I have no idea what is wrong with my code. I successfully make my table and insert the data, why is it telling me CatCode is an invalid identifier?...
( I originally posted it in the wrong section whoops )

Answer 1

Zombnom wrote:
There isn't, I'm trying to ADD a column with CatCode being a foreign key in the books table.Well there's your problem. Column and foreign key are two seperate things. You can combine the two operations though:
ALTER TABLE books ADD catcode CONSTRAINT books_category_fk REFERENCES category(catcode);