How to update all columns with INSERT ... ON CONFLICT ...?
<p>I have a table with a single primary key. When I attempt to do an insert there may be a conflict caused by trying to insert a row with an existing key. I want to allow the insert to update all columns? Is there any easy syntax for this? I am trying to let it "upsert" all columns.</p>

<p>I am using PostgreSQL 9.5.5.</p>