POSTGRESQL INSERT CONFLICT UPDATE
Hint: Ensure that no rows proposed for insertion within the same command have duplicate constrained values.īelow is a contrived example of the table and the query CREATE TABLE users (Īn example query is as follows: insert into users (user, user_email, is_active, conflict (user, user_email)ĭo update set is_active = excluded.is_active, is_admin = excluded.is_admin When this query runs, I get the error: SQL Error : ERROR: ON CONFLICT DO UPDATE command cannot affect row a second time I am adding an ON CONFLICT statement to the insert query hoping that the last row being inserted is the final value.
List of values passed there might be duplicates. When inserting multiple values at a time (batching) conflicts might happen since in the When you do an on conflict clause that would require to move the row into another partition (updating the partition key) it will fail.I have a table where the primary key is a combination of two columns. Postgres=# insert into part(a,b,list) values (1,2,'beer') on conflict (a,list) do update set list='wine' ĭETAIL: The result tuple would appear in a different partition than the original tuple. This feature is also known as UPSERT or INSERT OVERWRITE. But be aware that there still is a case which is not working: The INSERT ON CONFLICT statement allows you to update an existing row that contains a primary key when you execute the INSERT statement to insert a new row that contains the same primary key. Postgres=# insert into part(a,b,list) values (1,2,'beer') on conflict (a,list) do update set b = 2 Ĭool. Postgres=# insert into part(a,b,list) values (2,2,'wine') List | character varying(5) | | not null | | extended | | INSERT INTO distributors (did, dname) VALUES (5, 'Gizmo Transglobal'), (6, 'Associated Computing, Inc') ON CONFLICT (did) DO UPDATE SET dname EXCLUDED.dname Insert a distributor, or do nothing for rows proposed for insertion when an existing, excluded row (a row with a matching constrained column or columns after before row insert triggers. Postgres=# alter table part add constraint pk1 primary key (a,list) I have built the following query instead, but it seems much more complicated to me, and I thought. PostgreSQL 11devel on x86_64-pc-linux-gnu, compiled by gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-16), 64-bit INSERT INTO knowledgestate (SELECT learnerid learnerid, loid FROM qblotag WHERE qbid NEW.qbid) ON CONFLICT DO NOTHING Unfortunately I can't use postgres 9.5 on some servers, and I need to convert it to a pre - 9.5 friendly query. Postgres=# insert into part_1(a,b,list) values (1,2,'beer') on conflict (a) do update set b = 2 īut who wants to do that directly on the partition? For sure this is a big limitation and not very useful. Postgres=# insert into part(a,b,list) values (1,2,'beer') on conflict (a) do update set b = 2 ĮRROR: ON CONFLICT clause is not supported with partitioned tablesĭoing that directly on the partition is working: When you try the following in PostgreSQL 10 it will fail: Postgres=# insert into part(a,b,list) values (2,2,'beer')
Postgres=# insert into part(a,b,list) values (1,1,'beer') Partition of: part FOR VALUES IN ('wine') Partition constraint: ((list IS NOT NULL) AND ((list)::text = ANY (ARRAY))) Partition of: part FOR VALUES IN ('beer')
Partitions: part_1 FOR VALUES IN ('beer'), List | character varying(5) | | | | extended | | Postgres=# create unique index iu2 on part_2 (a) Ĭolumn | Type | Collation | Nullable | Default | Storage | Stats target | Description Postgres=# create unique index iu1 on part_1 (a) Postgres=# create table part_2 partition of part for values in ('wine') Postgres=# create table part_1 partition of part for values in ('beer') Postgres=# create table part ( a int, b int, list varchar(5) ) partition by list (list) If a column list is specified, you only need INSERT privilege on the listed columns. If ON CONFLICT DO UPDATE is present, UPDATE privilege on the table is also required. PostgreSQL 10.0 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-16), 64-bit You must have INSERT privilege on a table in order to insert into it. We’ll again use the slightly modified little list partitioned table from the last post, here in PostgreSQL 10: Another partitioning improvement for PostgreSQL 11: Insert…on conflict is now supported (for most cases) in PostgreSQL 11 thanks to this commit.
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