PostgreSQL multi-value upserts

Question

is it possible to perform a multi-value upsert in PostgreSQL? I know multi-value inserts exist, as do the \"ON CONFLICT\" key words to perform an update if the key is viola

Answer 1

Multi-valued upsert is definitely possible, and a significant part of why insert ... on conflict ... was implemented.

CREATE TABLE table1(col1 int, col2 text, constraint theconstraint unique(col1));

INSERT INTO table1 VALUES (1, 'parrot'), (4, 'turkey');

INSERT INTO table1 VALUES (1, 'foo'), (2,'bar'), (3,'baz')
ON CONFLICT ON CONSTRAINT theconstraint
DO UPDATE SET col2 = EXCLUDED.col2;

results in

regress=> SELECT * FROM table1 ORDER BY col1;
 col1 | col2 
------+------
    1 | foo
    2 | bar
    3 | baz
    4 | turkey
(4 rows)

If the docs were unclear, please submit appropriate feedback to the pgsql-general mailing list. Or even better, propose a patch to the docs.

Answer 2

1.Before the insert

2.Command

3.After the insert