SQL Developer ORACLE SCRPT

Question

I have a table with 2 columns

Common name	usr_name
ABC 123	123
CDE 123	XYZ 123

I'm trying to find a PL SQL script that would go through all the users in the common name column and if the Common name not equal usr_name then it updates the usr name and makes it the same as common name

should look like this

if common name != usr name // update usr_name == common name

Answer 1

You do not need PL/SQL, use an UPDATE SQL statement and put your logic in the WHERE clause:

UPDATE table_name
SET   usr_name = common_name
WHERE usr_name != common_name
OR    (usr_name IS NOT NULL AND common_name IS NULL)
OR    (usr_name IS NULL AND common_name IS NOT NULL)

Which, for the sample data:

CREATE TABLE table_name (Common_name, usr_name) AS
SELECT 'ABC 123', '123' FROM DUAL UNION ALL
SELECT 'CDE 123', 'XYZ 123' FROM DUAL

Then, after the update the table contains:

COMMON_NAME	USR_NAME
ABC 123	ABC 123
CDE 123	CDE 123

db<>fiddle here