Web Reference: PostgreSQL's INSERT...ON CONFLICT construct allows you to choose between two options when a proposed record conflicts with an existing record. Both DO NOTHING and DO UPDATE have their uses depending on the way the data you're adding relates to the existing content. The sourcecolumn is an optional addition to demonstrate how this works. You may actually need it to tell the difference between both cases (another advantage over empty writes). The final JOIN chats works because newly inserted rows from an attached data-modifying CTEare not yet visible in the underlying table. (All parts of the same SQL statement ... The SQL ON CONFLICT clause is a powerful feature in PostgreSQL that allows you to handle conflicts, such as duplicate key violations, during INSERT operations, enabling seamless upserts (update or insert) without complex logic.
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