Column check constraint cannot reference other columns !????

Question

Hello,
why it don't work?
I have read that Check Constraint must work with other columns. What is the Problem here (KK_ID)?
DROP TABLE Pat CASCADE CONSTRAINTS;
CREATE TABLE Pat
PAT_ID           NUMBER(12) NOT NULL
          CONSTRAINT pat_id PRIMARY KEY initially immediate,
NAME           VARCHAR2(50)NOT NULL initially immediate,
date_b          DATE NOT NULL initially immediate,
PRIVAT_KNZ VARCHAR2(20)
          CONSTRAINT PRIVAT_KNZ_ CHECK (UPPER(PRIVAT_KNZ) in ('Y','N')) initially deferred,
KK_ID           NUMBER(10)
          CONSTRAINT KK_ID CHECK      ((UPPER(PRIVAT_KNZ) in ('N')) AND KK_ID is NOT NULL) OR ((UPPER(PRIVAT_KNZ) in ('Y')),
          CONSTRAINT REF_KEY_KK FOREIGN KEY (KK_ID)
          REFERENCES Tab2 (KK_ID) initially deferred          
The field KK_ID must became a value if PRIVAT_KNZ has a 'N'. If PRIVAT_KNZ has a value 'Y' then can KK_ID have a NULL or a value.
ERROR__________________________________________________________________
DROP TABLE Patient CASCADE CONSTRAINTS
ERROR at line 1:
ORA-00942: table or view does not exist
          CONSTRAINT KK_ID CHECK      ((UPPER(PRIVAT_KNZ) in ('N')) AND KK_ID is NOT NULL) OR ((UPPER(PRIVAT_KNZ) in ('J')),
ERROR at line 12:
ORA-02438: Column check constraint cannot reference other columns
Thank you in advance!!!!
Andrej

Answer 1

Thank You very much!
It works great!
But i don't understand why i must put coma, after
KK_ID                NUMBER(10) NUll REFERENCES KRANKENKASSE ,
And then follows the contstraint? How can i see, that constraint KK_ID belongs to column KK_ID?
How can i make,than the constrain belongs to definition of Columns KK_ID?
Thank you in advance!
DROP TABLE Krankenkasse CASCADE CONSTRAINTS;
CREATE TABLE Krankenkasse
KK_ID                NUMBER(10)
                    CONSTRAINT KK_id_PR PRIMARY KEY,
BEZEICHNUNG          VARCHAR2(20)
INSERT INTO Krankenkasse VALUES(1, 'AOK');
INSERT INTO Krankenkasse VALUES(2, 'Techniker');
INSERT INTO Krankenkasse VALUES(3, 'Barmer');
DROP TABLE Patient CASCADE CONSTRAINTS;
CREATE TABLE Patient
PATIENTEN_ID           NUMBER(12) NOT NULL
     CONSTRAINT pat_id PRIMARY KEY initially immediate,
NACHNAME           VARCHAR2(50)NOT NULL initially immediate,
VORNAME           VARCHAR2(20)NOT NULL initially immediate,
ADRESSE           VARCHAR2(100)Null,
GEB_DATUM           DATE NOT NULL initially immediate,
PRIVAT_KNZ           VARCHAR2(20)
               CONSTRAINT PRIVAT_KNZ CHECK (UPPER(PRIVAT_KNZ) in ('J','N'))
               initially deferred,
KK_ID                NUMBER(10) NUll REFERENCES KRANKENKASSE,
               CONSTRAINT KK_ID CHECK
               ((Upper(PRIVAT_KNZ) in ('N') AND KK_ID is NOT Null) OR (UPPER(PRIVAT_KNZ)in ('J')))
INSERT INTO PATIENT VALUES(1,'Schmidt','Bernd','Adresse1', TO_DATE('01101965', 'DDMMRRRR'),'N',1);
INSERT INTO PATIENT VALUES(2,'Mueller','Heiko','Adresse2', TO_DATE('15061955', 'DDMMRRRR'),'N',1);
INSERT INTO PATIENT VALUES(3,'Becker','Josef','Adresse3', TO_DATE('03101947', 'DDMMRRRR'),'J',2);
INSERT INTO PATIENT VALUES(4,'Winter','Paul','Adresse4', TO_DATE('01051933', 'DDMMRRRR'),'J',Null);
INSERT INTO PATIENT VALUES(5,'Winter','Paul','Adresse4', TO_DATE('01051933', 'DDMMRRRR'),'N',Null);
commit;
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