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https://stackoverflow.com/questions/59434201/support-of-merge-query-in-postgresql
The link is not the manual, but the Wiki where ideas are documented or discussed. And you apparently overlooked the message at the top that says: "This was never integrated into PostgreSQL, and requires significant work to be production quality" - If you want to see what commands are supported, check the SQL reference - you can use insert on conflict instead – a_horse_with_no_name Dec 21 at 7:41
https://www.depesz.com/2018/04/10/waiting-for-postgresql-11-merge-sql-command-following-sql2016/
MERGE is not intended to be used in preference to existing single SQL commands for INSERT, UPDATE or DELETE since there is some overhead. MERGE can be used statically from PL/pgSQL. MERGE does not yet support inheritance, write rules, RETURNING clauses, updatable views or foreign tables. MERGE follows SQL Standard per the most recent SQL:2016.
https://www.postgresql.org/message-id/attachment/23520/sql-merge.html
First, the MERGE command performs a left outer join from source query to target table, producing zero or more merged rows. For each merged row, WHEN clauses are evaluated in the specified order until one of them is activated. The corresponding action is then applied and processing continues for the next row.
https://wiki.postgresql.org/wiki/SQL_MERGE
Feb 01, 2018 · PostgreSQL doesn't have a good way to lock access to a key value that doesn't exist yet--what other databases call key range locking ( SQL Server for example). Improvements to the index implementation are needed to allow this feature. Add a subset of MERGE support sufficient to implement REPLACE/UPSERT.
https://www.postgresqltutorial.com/postgresql-upsert/
Introduction to the PostgreSQL upsert. In relational databases, the term upsert is referred to as a merge. The idea is that when you insert a new row into the table, PostgreSQL will update the row if it already exists, otherwise, PostgreSQL inserts the new row. That is why we call the action is upsert (update or insert).
https://wiki.postgresql.org/wiki/UPSERT
May 13, 2015 · PostgreSQL (today) To correctly UPSERT in PostgreSQL today, without any dedicated, native support, one must use a retry loop in READ COMMITTED mode. The ad-hoc implementation should attempt an INSERT, and if that fails, UPDATE.
https://dba.stackexchange.com/questions/203292/difference-between-upsert-and-merge
From the PostgreSQL wiki, MERGE is typically used to merge two tables, and was introduced in the 2003 SQL standard. The REPLACE statement (a MySQL extension) or UPSERT sequence attempts an UPDATE, or on failure, INSERT. This is similar to UPDATE, then for unmatched rows, INSERT.
https://www.postgresql.org/support/
Commercial support is also available from one of the many companies providing professional services to the PostgreSQL community. A list of companies that provide PostgreSQL-specific hosting is also available. Bug Reporting. Found a bug in PostgreSQL? Please read over our bug reporting guidelines and then report it using our bug reporting form.
https://www.postgresql.org/docs/9.1/queries-with.html
7.8. WITH Queries (Common Table Expressions). WITH provides a way to write auxiliary statements for use in a larger query. These statements, which are often referred to as Common Table Expressions or CTEs, can be thought of as defining temporary tables that exist just for one query.Each auxiliary statement in a WITH clause can be a SELECT, INSERT, UPDATE, or DELETE; and the WITH clause …
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