conditional primary key based on value not being null - sql

Question

I have a table that has a composite primary key:
CREATE TABLE tb (
it_service VARCHAR2(200),
hostname VARCHAR2(255),
sw_name VARCHAR2(200 CHAR),
product_home VARCHAR2(500),
product_home_ods VARCHAR2(500),
instance_name VARCHAR2(255),
eg_status VARCHAR2(10),
);
ALTER TABLE tb ADD (
CONSTRAINT pk_tb PRIMARY KEY ( hostname,
instance_name,
product_home,
product_home_ods,
it_service,
sw_name )
);
The problem is that when I insert into this table, the data from the product_home column is null for the rows where product_home_ods has data. The same applies product_home_ods, the rows where that table contain data are null for product_home.
Example:
product_home product_home_ods
java null
python null
null windows
null windows_server
Is it possible to create a primary key based on the condition of these columns ? I understand a primary key should not contain null values, but unsure about the best way to tackle this problem.

Answer 1

And changing to this model ?
product_home will never be NULL and ods_flag will indicate if it should be interpreted a product_home or product_home_ods, something you can do in a view to get back the same data as your original table.
CREATE TABLE tb (
it_service VARCHAR2(200),
hostname VARCHAR2(255),
sw_name VARCHAR2(200 CHAR),
product_home VARCHAR2(500),
ods_flag NUMBER(1,0),
instance_name VARCHAR2(255),
eg_status VARCHAR2(10),
);
ALTER TABLE tb ADD (
CONSTRAINT pk_tb PRIMARY KEY ( hostname,
instance_name,
product_home,
ods_flag,
it_service,
sw_name )
);
(As long as product_home and product_home_ods of your original table are not foreign keys)