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--
-- UPDATE ... SET <col> = DEFAULT;
--
CREATE TABLE update_test (
a INT DEFAULT 10,
b INT
);
INSERT INTO update_test VALUES (5, 10);
INSERT INTO update_test VALUES (10, 15);
SELECT * FROM update_test;
a | b
----+----
5 | 10
10 | 15
(2 rows)
UPDATE update_test SET a = DEFAULT, b = DEFAULT;
SELECT * FROM update_test;
a | b
----+---
10 |
10 |
(2 rows)
-- aliases for the UPDATE target table
UPDATE update_test AS t SET b = 10 WHERE t.a = 10;
SELECT * FROM update_test;
a | b
----+----
10 | 10
10 | 10
(2 rows)
UPDATE update_test t SET b = t.b + 10 WHERE t.a = 10;
SELECT * FROM update_test;
a | b
----+----
10 | 20
10 | 20
(2 rows)
-- if an alias for the target table is specified, don't allow references
-- to the original table name
BEGIN;
SET LOCAL add_missing_from = false;
UPDATE update_test AS t SET b = update_test.b + 10 WHERE t.a = 10;
ERROR: invalid reference to FROM-clause entry for table "update_test"
LINE 1: UPDATE update_test AS t SET b = update_test.b + 10 WHERE t.a...
^
HINT: Perhaps you meant to reference the table alias "t".
ROLLBACK;
DROP TABLE update_test;
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