ORA-00904 invalid identifier code - oracle10g

Question

Please help me with this code. i try to create a table but it keep poping out the error ORA-00904: : invalid identifier
CREATE TABLE tblParentMaster
( HOHCodeid VARCHAR2(10),
Parent1 VARCHAR2(10),
Address VARCHAR2(30),
Home_Phone_Number CHAR(10),
Address1 VARCHAR2(30),
City VARCHAR2(20),
States CHAR(2),
Zip CHAR(5),
Parent2Code VARCHAR2(10),
Parent2 VARCHAR2(10),
Address2 VARCHAR2(30),
Volunteer CHAR(1) DEFAULT 'N',
Email VARCHAR2(20),
CONSTRAINT pk_tblParentMaster_HOHCode PRIMARY KEY (HOHCode),
CONSTRAINT nn_tblParentMaster_Parent1 NOT NULL (Parent1),
CONSTRAINT ck_tblParentMaster_Volunteer CHECK (Volunteer IN ('Y', 'N'))
);

Answer 1

That isn't how you declare a not-null constraint. You can either have a named constraint, as shown in the documentation:
...
Parent1 VARCHAR2(10),
...
CONSTRAINT nn_tblParentMaster_Parent1 CHECK (Parent1 is NOT NULL)
...
Or declare it in-line, which won't have a nice name:
...
Parent1 VARCHAR2(10) NOT NULL,
...
Your PK is wrong as well, you don't have a column called just HOHCode:
CONSTRAINT pk_tblParentMaster_HOHCode PRIMARY KEY (HOHCodeId),
So:
CREATE TABLE tblParentMaster
( HOHCodeid VARCHAR2(10),
Parent1 VARCHAR2(10),
Address VARCHAR2(30),
Home_Phone_Number CHAR(10),
Address1 VARCHAR2(30),
City VARCHAR2(20),
States CHAR(2),
Zip CHAR(5),
Parent2Code VARCHAR2(10),
Parent2 VARCHAR2(10),
Address2 VARCHAR2(30),
Volunteer CHAR(1) DEFAULT 'N',
Email VARCHAR2(20),
CONSTRAINT pk_tblParentMaster_HOHCode PRIMARY KEY (HOHCodeId),
CONSTRAINT nn_tblParentMaster_Parent1 CHECK (Parent1 is NOT NULL),
CONSTRAINT ck_tblParentMaster_Volunteer CHECK (Volunteer IN ('Y', 'N'))
);
table TBLPARENTMASTER created.