Charles Leifer <coleifer@xxxxxxxxx> writes:
> I'm running into behavior I don't understand when trying to do an UPSERT
> with Postgres. The docs would seem to indicate that the conflict target of
> the INSERT statement can be either an index expression or a constraint
> name. However, when attempting to reference the constraint name, I get a
> "column ... does not exist" error.
What I see in the INSERT reference page is
where conflict_target can be one of:
( { index_column_name | ( index_expression ) } [ COLLATE collation ] [ opclass ] [, ...] ) [ WHERE index_predicate ]
ON CONSTRAINT constraint_name
So you can write a parenthesized list of column names, or you can write
"ON CONSTRAINT constraint_name". Given your second example with
create table kv (
key text,
value text,
extra text,
constraint kv_key_value unique(key, value));
either of these work for me:
regression=# insert into kv (key, value, extra) values ('k1', 'v1', 'e1')
on conflict (key, value) do update set extra=excluded.extra;
INSERT 0 1
regression=# insert into kv (key, value, extra) values ('k1', 'v1', 'e1')
on conflict on constraint kv_key_value do update set extra=excluded.extra;
INSERT 0 1
regards, tom lane
