Postgres UPSERT (INSERT or UPDATE) only if value is different

Question

I\'m updating a Postgres 8.4 database (from C# code) and the basic task is simple enough: either UPDATE an existing row or INSERT a new one if one doesn\'t exist yet. Normally I

Answer 1

INSERT INTO table_name(column_list) VALUES(value_list) ON CONFLICT target action;

https://www.postgresqltutorial.com/postgresql-upsert/

Dummy example :

insert into user_profile (user_id, resident_card_no, last_name) values
 (103, '14514367', 'joe_inserted' ) 
on conflict on constraint user_profile_pk do 
update set resident_card_no = '14514367', last_name = 'joe_updated';