upsert

I'm finding that using writable CTEs to emulate an upsert in PostgreSQL to be quite an elegant solution until we get actual upsert/merge in Postgres. (see: https://stackoverflow.com/a/8702291/558819 ) However, there is one problem: how can I insert the default value? Using NULL won't help of course as NULL gets explicitly inserted as NULL , unlike for example with MySQL. An example: WITH new_values (id, playlist, item, group_name, duration, sort, legacy) AS ( VALUES (651, 21, 30012, 'a', 30, 1, FALSE) , (NULL::int, 21, 1, 'b', 34, 2, NULL::boolean) , (668, 21, 30012, 'c', 30, 3, FALSE) , (7428

Disclaimer: theoretical question. Several questions here was asked about how to differentiate inserted and updated rows in the PostgreSQL upsert statement. Here is a simple example: nd@postgres=# create table t(i int primary key, x int); nd@postgres=# insert into t values(1,1); nd@postgres=# insert into t values(1,11),(2,22) on conflict(i) do update set x = excluded.i*11 returning *, xmin, xmax; ╔═══╤════╤══════╤══════╗ ║ i │ x │ xmin │ xmax ║ ╠═══╪════╪══════╪══════╣ ║ 1 │ 11 │ 7696 │ 7696 ║ ║ 2 │ 22 │ 7696 │ 0 ║ ╚═══╧════╧══════╧══════╝ So, xmax > 0 (or xmax = xmin ) - row was updated; xmax

How can I do a bulk upsert in pymongo? I want to Update a bunch of entries and doing them one at a time is very slow. The answer to an almost identical question is here: Bulk update/upsert in MongoDB? The accepted answer doesn't actually answer the question. It simply gives a link to the mongo CLI for doing import/exports. I would also be open to someone explaining why doing a bulk upsert is no possible / no a best practice, but please explain what the preferred solution to this sort of problem is. Kevin J. Rice MongoDB 2.6+ has support for bulk operations. This includes bulk inserts, upserts,

I've got this table (generated by Django): CREATE TABLE feeds_person ( id serial PRIMARY KEY, created timestamp with time zone NOT NULL, modified timestamp with time zone NOT NULL, name character varying(4000) NOT NULL, url character varying(1000) NOT NULL, email character varying(254) NOT NULL, CONSTRAINT feeds_person_name_ad8c7469_uniq UNIQUE (name, url, email) ); I'm trying to bulk insert a lot of data using INSERT with an ON CONFLICT clause. The wrinkle is that I need to get the id back for all of the rows, whether they're already existing or not. In other cases, I would do something like:

I've never seen the syntax INSERT OR REPLACE INTO names (id, name) VALUES (1, "John") used in SQL before, and I was wondering why it's better than UPDATE names SET name = "John" WHERE id = 1 . Is there any good reason to use one over the other. Is this syntax specific to SQLite? Adriaan Stander UPDATE will not do anything if the row does not exist. Where as the INSERT OR REPLACE would insert if the row does not exist, or replace the values if it does. cybergen I'm currently working on such a statement and figured out another fact to notice: INSERT OR REPLACE will replace any values not