Oracle query to PostgreSQL conversion

Question

Could you please help with some converted Oracle queries to postgreSQL queries, it is exists?

I have an Oracle query which I want to adopt for postgreSQL, could you please help me with this?

merge into TABLE_NAME using dual on 
(ID='CF9EB9FE6F6D4CC9B75EC0CD420421B91541944569' and ANOTHER_ID='E198D55909D94895AF747ED7E032AC58') 
when matched then update set USER='USERNAME' 
when not matched then insert values('EEA2620A4A0F31CE05E69B','CFB75EC0CD41B91541944569','E198D55909D94895AF747ED7E032AC58','USERNAME',null) 

Answer 1

You do the upsert in Postgres using insert . . . on conflict:

insert into table_name (?, id, anotherid, ?, ?)   -- put in the column names
    values('EEA2620A4A0F31CE05E69B', 
           'CFB75EC0CD41B91541944569', 
           'E198D55909D94895AF747ED7E032AC58',
           'USERNAME', null
          )
    on conflict (id, anotherid)
    do update set USER = 'USERNAME';

You want a unique constraint on (id, anotherid) so the conflict is recognized:

alter table table_name add constraint unq_tablename_id_anotherid unique (id, anotherid);

The unique constraint needs to be defined on the columns that would cause the conflict.