> On Sep 24, 2022, at 07:29, Barry Kimelman <blkimelman@xxxxxxxxx> wrote: > > CREATE UNIQUE INDEX my_companies_company_name_unique ON my_companies(company_name) WHERE delete_timestamp IS NULL; The issue here is that the unique index is partial (it has a WHERE clause). In order to use that as an arbiter, you need include a WHERE clause in the ON CONFLICT clause that matches the one on the index. I believe that something like: insert into my_companies (second_id,string_company_id,company_name,person_name) values (1,'66','widgets','seller-toto') on conflict (company_name) where delete_timestamp IS NULL do update set company_name = concat(company_name,'++',string_company_id) ... will work. Note that if you do an insert with a duplicate "company_name", but "delete_timestamp" not null, it *won't* treat that as a conflict and won't run the ON CONFLICT action; it'll just insert the row.
