Add Primary Key To A Column In A Table With Data

In today’s article, we will learn how to add a primary key to a column in a table containing data in an Oracle database.

If we want to add a primary key to a column of a table with data and we get an error, the following process is followed.

1. We create a new table from the table to which the Primary Key will be added.

CREATE TABLE HEMW.IPTV_TEST_ABONE_NEW TABLESPACE HE_USERS AS (SELECT * FROM 
HEMW.IPTV_TEST_ABONE);

1 2	CREATE TABLE HEMW.IPTV_TEST_ABONE_NEW TABLESPACE HE_USERS AS (SELECT * FROM HEMW.IPTV_TEST_ABONE);

2. We Truncate the table to which the Primary Key will be added.

TRUNCATE TABLE HEMW.IPTV_TEST_ABONE;

1	TRUNCATE TABLE HEMW.IPTV_TEST_ABONE;

3. Now we add a Primary Key to the table to which the Primary Key will be added.

ALTER TABLE HEMW.IPTV_TEST_ABONE ADD CONSTRAINT ACCOUNTNAME__ITA_PK PRIMARY KEY 
(ACCOUNTNAME);

1 2	ALTER TABLE HEMW.IPTV_TEST_ABONE ADD CONSTRAINT ACCOUNTNAME__ITA_PK PRIMARY KEY (ACCOUNTNAME);

4. We insert data from the newly created table into the original table.

INSERT INTO HEMW.IPTV_TEST_ABONE SELECT * FROM HEMW.IPTV_TEST_ABONE_NEW;
COMMIT;

1 2	INSERT INTO HEMW.IPTV_TEST_ABONE SELECT * FROM HEMW.IPTV_TEST_ABONE_NEW; COMMIT;

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