Impossible to post duplicate keys found

I am trying to create a Unique column in the table oms_product_group product_group_name constraint.

It is parent to child relationship as parent_id will be same for some the product_group_name

Example:

product_group_name parent_id

-----------------------------------------------

All                                           0

Mobile                                     1

Laptop                                    1

Men                                        2

Men 2 (<-if I have already created MEN then it must not allow me recreate)

Android                                   3

What I tried.

ALTER table OMS_PRODUCT_GROUP add constraint OMS_PRODUCT_GROUP_NAME_UN unique (PRODUCT_GROUP_NAME) can be POSTPONED to the IMMEDIATE DEPARTURE;

ERROR: ORA-02299: cannot validate (ECUBE. OMS_PRODUCT_GROUP_NAME_UN) - duplicate keys found

ALTER table OMS_PRODUCT_GROUP add novalidate constraint OMS_PRODUCT_GROUP_NAME_UN

using index (create indexes unique_index on OMS_PRODUCT_GROUP (PRODUCT_GROUP_NAME));

ORA-02253: specification of constraints not allowed here

So basically that if one introduces a value name it cannot reinsert eponymous value which is I have created unique key constraints.

Thank you

Pranav Shah.

If I understand you correctly, you want the constraint to apply oneness in the future, yet allow existing duplicates.

To do this, you will need to use a not unique to manage the constraint of the index, and you must specify ENABLE NOVALIDATE. See line 16 below.

SQL> drop table t purge;

Table T dropped.

SQL> create table t ( n) as
select 1 from dual
union all
select 1 from dual;

Table T created.

SQL> alter table t add constraint tu unique(n) using index(create index tu on t(n)) enable novalidate;

Table T altered.

SQL> insert into t values(1);

Error starting at line : 8 in command -
insert into t values(1)
Error report -
SQL Error: ORA-00001: unique constraint (STEW.TU) violated
00001. 00000 -  "unique constraint (%s.%s) violated"
*Cause:    An UPDATE or INSERT statement attempted to insert a duplicate key.
           For Trusted Oracle configured in DBMS MAC mode, you may see
           this message if a duplicate entry exists at a different level.
*Action:   Either remove the unique restriction or do not insert the key.

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