Download Postgres Multiple On Conflict Statements doc. If not, a new row should be inserted. The table has two columns, id and value, where the id specifies the counter we are referring to, and value is the number of times the counter has been incremented. Since Postgres 9.5, Postgres has supported a useful a feature called UPSERT. Here is a table of key, value pairs: demo=# SELECT * FROM kv; key | value -----+----- host | 127.0.0.1 port | 5432 (2 rows) A common use case is to insert a row only if it does not exist – and if it does, do not overwrite. Depesz already wrote a blog post about it and showed that it works pretty much like serial columns: CREATE TABLE test_old ( id serial PRIMARY KEY, payload text ); INSERT INTO test_old (payload) VALUES ('a'), ('b'), ('c') RETURNING *; and CREATE TABLE […] Marked as the number #1 wanted feature in Postgres that has been missing for years by many people, ... being an extension of the INSERT query can be defined with two different behaviors in case of a constraint conflict: DO NOTHING or DO UPDATE. This article reviews how to use the basic data manipulation language (DML) types INSERT, UPDATE, UPDATE JOINS, DELETE, and UPSERT to modify data in tables. PostgreSQL cannot find your unique index based on the two columns company_id and personnel_no, even if the index does exist. This is a problem for UPSERT. I see an elephant in the room:... and deleted_date is null There can be rows with non-null deleted_date, which are ignored by your test with SELECT but still conflict in the unique index on (feed_id,feed_listing_id).. Aside, NOT IN (SELECT ...) is almost always a bad choice. Why? PostgreSQL: Insert – Update or Upsert – Merge using writable CTE. e.g. Regardless, I don't think there's any theoretical way to support UPSERT without a unique constraint. The first is to tell Postgres to do nothing when a conflict blocks the insert operation. Why? Hostname is the primary key and ip is an array of IPs. Each value following the VALUES clause must be of the same data type as the column it is being inserted into. The way PostgreSQL handles upserts implemented with ON CONFLICT leads to the sequence corresponding to the ID column increasing even in the conflict (and update) case. Therefore eventual support of this would require a full table lock. So this technique may not be feasible in cases where successful inserts happen rarely but queries like above are executed rapidly. when all that pass, the prepared insert, when executed and with a conflict, should be re-attempt with NEW call to that DEFAULT function of the indicated CONFLICT column(s). I don't know that that is the *expectation*. Summary: in this tutorial, you will learn about PostgreSQL UNIQUE constraint to make sure that values stored in a column or a group of columns are unique across rows in a table. For example: INSERT INTO contacts (contact_id, last_name, first_name, country) VALUES (250, 'Anderson', 'Jane', DEFAULT); This PostgreSQL INSERT statement … Postgresql, update if row with some unique value exists, else insert , This newly option has two varieties: INSERT ON CONFLICT DO UPDATE: If record matched, it is updated with the new data value. Postgres conditional insert. 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