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--
-- CONSTRAINTS
-- Constraints can be specified with:
-- - DEFAULT clause
-- - CHECK clauses
-- - PRIMARY KEY clauses
-- - UNIQUE clauses
-- - EXCLUDE clauses
--
-- directory paths are passed to us in environment variables
\getenv abs_srcdir PG_ABS_SRCDIR
--
-- DEFAULT syntax
--
CREATE TABLE DEFAULT_TBL (i int DEFAULT 100,
x text DEFAULT 'vadim', f float8 DEFAULT 123.456);
INSERT INTO DEFAULT_TBL VALUES (1, 'thomas', 57.0613);
INSERT INTO DEFAULT_TBL VALUES (1, 'bruce');
INSERT INTO DEFAULT_TBL (i, f) VALUES (2, 987.654);
INSERT INTO DEFAULT_TBL (x) VALUES ('marc');
INSERT INTO DEFAULT_TBL VALUES (3, null, 1.0);
SELECT * FROM DEFAULT_TBL;
CREATE SEQUENCE DEFAULT_SEQ;
CREATE TABLE DEFAULTEXPR_TBL (i1 int DEFAULT 100 + (200-199) * 2,
i2 int DEFAULT nextval('default_seq'));
INSERT INTO DEFAULTEXPR_TBL VALUES (-1, -2);
INSERT INTO DEFAULTEXPR_TBL (i1) VALUES (-3);
INSERT INTO DEFAULTEXPR_TBL (i2) VALUES (-4);
INSERT INTO DEFAULTEXPR_TBL (i2) VALUES (NULL);
SELECT * FROM DEFAULTEXPR_TBL;
-- syntax errors
-- test for extraneous comma
CREATE TABLE error_tbl (i int DEFAULT (100, ));
-- this will fail because gram.y uses b_expr not a_expr for defaults,
-- to avoid a shift/reduce conflict that arises from NOT NULL being
-- part of the column definition syntax:
CREATE TABLE error_tbl (b1 bool DEFAULT 1 IN (1, 2));
-- this should work, however:
CREATE TABLE error_tbl (b1 bool DEFAULT (1 IN (1, 2)));
DROP TABLE error_tbl;
--
-- CHECK syntax
--
CREATE TABLE CHECK_TBL (x int,
CONSTRAINT CHECK_CON CHECK (x > 3));
INSERT INTO CHECK_TBL VALUES (5);
INSERT INTO CHECK_TBL VALUES (4);
INSERT INTO CHECK_TBL VALUES (3);
INSERT INTO CHECK_TBL VALUES (2);
INSERT INTO CHECK_TBL VALUES (6);
INSERT INTO CHECK_TBL VALUES (1);
SELECT * FROM CHECK_TBL;
CREATE SEQUENCE CHECK_SEQ;
CREATE TABLE CHECK2_TBL (x int, y text, z int,
CONSTRAINT SEQUENCE_CON
CHECK (x > 3 and y <> 'check failed' and z < 8));
INSERT INTO CHECK2_TBL VALUES (4, 'check ok', -2);
INSERT INTO CHECK2_TBL VALUES (1, 'x check failed', -2);
INSERT INTO CHECK2_TBL VALUES (5, 'z check failed', 10);
INSERT INTO CHECK2_TBL VALUES (0, 'check failed', -2);
INSERT INTO CHECK2_TBL VALUES (6, 'check failed', 11);
INSERT INTO CHECK2_TBL VALUES (7, 'check ok', 7);
SELECT * from CHECK2_TBL;
--
-- Check constraints on INSERT
--
CREATE SEQUENCE INSERT_SEQ;
CREATE TABLE INSERT_TBL (x INT DEFAULT nextval('insert_seq'),
y TEXT DEFAULT '-NULL-',
z INT DEFAULT -1 * currval('insert_seq'),
CONSTRAINT INSERT_TBL_CON CHECK (x >= 3 AND y <> 'check failed' AND x < 8),
CHECK (x + z = 0));
INSERT INTO INSERT_TBL(x,z) VALUES (2, -2);
SELECT * FROM INSERT_TBL;
SELECT 'one' AS one, nextval('insert_seq');
INSERT INTO INSERT_TBL(y) VALUES ('Y');
INSERT INTO INSERT_TBL(y) VALUES ('Y');
INSERT INTO INSERT_TBL(x,z) VALUES (1, -2);
INSERT INTO INSERT_TBL(z,x) VALUES (-7, 7);
INSERT INTO INSERT_TBL VALUES (5, 'check failed', -5);
INSERT INTO INSERT_TBL VALUES (7, '!check failed', -7);
INSERT INTO INSERT_TBL(y) VALUES ('-!NULL-');
SELECT * FROM INSERT_TBL;
INSERT INTO INSERT_TBL(y,z) VALUES ('check failed', 4);
INSERT INTO INSERT_TBL(x,y) VALUES (5, 'check failed');
INSERT INTO INSERT_TBL(x,y) VALUES (5, '!check failed');
INSERT INTO INSERT_TBL(y) VALUES ('-!NULL-');
SELECT * FROM INSERT_TBL;
SELECT 'seven' AS one, nextval('insert_seq');
INSERT INTO INSERT_TBL(y) VALUES ('Y');
SELECT 'eight' AS one, currval('insert_seq');
-- According to SQL, it is OK to insert a record that gives rise to NULL
-- constraint-condition results. Postgres used to reject this, but it
-- was wrong:
INSERT INTO INSERT_TBL VALUES (null, null, null);
SELECT * FROM INSERT_TBL;
--
-- Check constraints on system columns
--
CREATE TABLE SYS_COL_CHECK_TBL (city text, state text, is_capital bool,
altitude int,
CHECK (NOT (is_capital AND tableoid::regclass::text = 'sys_col_check_tbl')));
INSERT INTO SYS_COL_CHECK_TBL VALUES ('Seattle', 'Washington', false, 100);
INSERT INTO SYS_COL_CHECK_TBL VALUES ('Olympia', 'Washington', true, 100);
SELECT *, tableoid::regclass::text FROM SYS_COL_CHECK_TBL;
DROP TABLE SYS_COL_CHECK_TBL;
--
-- Check constraints on system columns other then TableOid should return error
--
CREATE TABLE SYS_COL_CHECK_TBL (city text, state text, is_capital bool,
altitude int,
CHECK (NOT (is_capital AND ctid::text = 'sys_col_check_tbl')));
--
-- Check inheritance of defaults and constraints
--
CREATE TABLE INSERT_CHILD (cx INT default 42,
cy INT CHECK (cy > x))
INHERITS (INSERT_TBL);
INSERT INTO INSERT_CHILD(x,z,cy) VALUES (7,-7,11);
INSERT INTO INSERT_CHILD(x,z,cy) VALUES (7,-7,6);
INSERT INTO INSERT_CHILD(x,z,cy) VALUES (6,-7,7);
INSERT INTO INSERT_CHILD(x,y,z,cy) VALUES (6,'check failed',-6,7);
SELECT * FROM INSERT_CHILD;
DROP TABLE INSERT_CHILD;
--
-- Check NO INHERIT type of constraints and inheritance
--
CREATE TABLE ATACC1 (TEST INT
CHECK (TEST > 0) NO INHERIT);
CREATE TABLE ATACC2 (TEST2 INT) INHERITS (ATACC1);
-- check constraint is not there on child
INSERT INTO ATACC2 (TEST) VALUES (-3);
-- check constraint is there on parent
INSERT INTO ATACC1 (TEST) VALUES (-3);
DROP TABLE ATACC1 CASCADE;
CREATE TABLE ATACC1 (TEST INT, TEST2 INT
CHECK (TEST > 0), CHECK (TEST2 > 10) NO INHERIT);
CREATE TABLE ATACC2 () INHERITS (ATACC1);
-- check constraint is there on child
INSERT INTO ATACC2 (TEST) VALUES (-3);
-- check constraint is there on parent
INSERT INTO ATACC1 (TEST) VALUES (-3);
-- check constraint is not there on child
INSERT INTO ATACC2 (TEST2) VALUES (3);
-- check constraint is there on parent
INSERT INTO ATACC1 (TEST2) VALUES (3);
DROP TABLE ATACC1 CASCADE;
--
-- Check constraints on INSERT INTO
--
DELETE FROM INSERT_TBL;
ALTER SEQUENCE INSERT_SEQ RESTART WITH 4;
CREATE TEMP TABLE tmp (xd INT, yd TEXT, zd INT);
INSERT INTO tmp VALUES (null, 'Y', null);
INSERT INTO tmp VALUES (5, '!check failed', null);
INSERT INTO tmp VALUES (null, 'try again', null);
INSERT INTO INSERT_TBL(y) select yd from tmp;
SELECT * FROM INSERT_TBL;
INSERT INTO INSERT_TBL SELECT * FROM tmp WHERE yd = 'try again';
INSERT INTO INSERT_TBL(y,z) SELECT yd, -7 FROM tmp WHERE yd = 'try again';
INSERT INTO INSERT_TBL(y,z) SELECT yd, -8 FROM tmp WHERE yd = 'try again';
SELECT * FROM INSERT_TBL;
DROP TABLE tmp;
--
-- Check constraints on UPDATE
--
UPDATE INSERT_TBL SET x = NULL WHERE x = 5;
UPDATE INSERT_TBL SET x = 6 WHERE x = 6;
UPDATE INSERT_TBL SET x = -z, z = -x;
UPDATE INSERT_TBL SET x = z, z = x;
SELECT * FROM INSERT_TBL;
-- DROP TABLE INSERT_TBL;
--
-- Check constraints on COPY FROM
--
CREATE TABLE COPY_TBL (x INT, y TEXT, z INT,
CONSTRAINT COPY_CON
CHECK (x > 3 AND y <> 'check failed' AND x < 7 ));
\set filename :abs_srcdir '/data/constro.data'
COPY COPY_TBL FROM :'filename';
SELECT * FROM COPY_TBL;
\set filename :abs_srcdir '/data/constrf.data'
COPY COPY_TBL FROM :'filename';
SELECT * FROM COPY_TBL;
--
-- Primary keys
--
CREATE TABLE PRIMARY_TBL (i int PRIMARY KEY, t text);
INSERT INTO PRIMARY_TBL VALUES (1, 'one');
INSERT INTO PRIMARY_TBL VALUES (2, 'two');
INSERT INTO PRIMARY_TBL VALUES (1, 'three');
INSERT INTO PRIMARY_TBL VALUES (4, 'three');
INSERT INTO PRIMARY_TBL VALUES (5, 'one');
INSERT INTO PRIMARY_TBL (t) VALUES ('six');
SELECT * FROM PRIMARY_TBL;
DROP TABLE PRIMARY_TBL;
CREATE TABLE PRIMARY_TBL (i int, t text,
PRIMARY KEY(i,t));
INSERT INTO PRIMARY_TBL VALUES (1, 'one');
INSERT INTO PRIMARY_TBL VALUES (2, 'two');
INSERT INTO PRIMARY_TBL VALUES (1, 'three');
INSERT INTO PRIMARY_TBL VALUES (4, 'three');
INSERT INTO PRIMARY_TBL VALUES (5, 'one');
INSERT INTO PRIMARY_TBL (t) VALUES ('six');
SELECT * FROM PRIMARY_TBL;
DROP TABLE PRIMARY_TBL;
--
-- Unique keys
--
CREATE TABLE UNIQUE_TBL (i int UNIQUE, t text);
INSERT INTO UNIQUE_TBL VALUES (1, 'one');
INSERT INTO UNIQUE_TBL VALUES (2, 'two');
INSERT INTO UNIQUE_TBL VALUES (1, 'three');
INSERT INTO UNIQUE_TBL VALUES (4, 'four');
INSERT INTO UNIQUE_TBL VALUES (5, 'one');
INSERT INTO UNIQUE_TBL (t) VALUES ('six');
INSERT INTO UNIQUE_TBL (t) VALUES ('seven');
INSERT INTO UNIQUE_TBL VALUES (5, 'five-upsert-insert') ON CONFLICT (i) DO UPDATE SET t = 'five-upsert-update';
INSERT INTO UNIQUE_TBL VALUES (6, 'six-upsert-insert') ON CONFLICT (i) DO UPDATE SET t = 'six-upsert-update';
-- should fail
INSERT INTO UNIQUE_TBL VALUES (1, 'a'), (2, 'b'), (2, 'b') ON CONFLICT (i) DO UPDATE SET t = 'fails';
SELECT * FROM UNIQUE_TBL;
DROP TABLE UNIQUE_TBL;
CREATE TABLE UNIQUE_TBL (i int UNIQUE NULLS NOT DISTINCT, t text);
INSERT INTO UNIQUE_TBL VALUES (1, 'one');
INSERT INTO UNIQUE_TBL VALUES (2, 'two');
INSERT INTO UNIQUE_TBL VALUES (1, 'three'); -- fail
INSERT INTO UNIQUE_TBL VALUES (4, 'four');
INSERT INTO UNIQUE_TBL VALUES (5, 'one');
INSERT INTO UNIQUE_TBL (t) VALUES ('six');
INSERT INTO UNIQUE_TBL (t) VALUES ('seven'); -- fail
INSERT INTO UNIQUE_TBL (t) VALUES ('eight') ON CONFLICT DO NOTHING; -- no-op
SELECT * FROM UNIQUE_TBL;
DROP TABLE UNIQUE_TBL;
CREATE TABLE UNIQUE_TBL (i int, t text,
UNIQUE(i,t));
INSERT INTO UNIQUE_TBL VALUES (1, 'one');
INSERT INTO UNIQUE_TBL VALUES (2, 'two');
INSERT INTO UNIQUE_TBL VALUES (1, 'three');
INSERT INTO UNIQUE_TBL VALUES (1, 'one');
INSERT INTO UNIQUE_TBL VALUES (5, 'one');
INSERT INTO UNIQUE_TBL (t) VALUES ('six');
SELECT * FROM UNIQUE_TBL;
DROP TABLE UNIQUE_TBL;
--
-- Deferrable unique constraints
--
CREATE TABLE unique_tbl (i int UNIQUE DEFERRABLE, t text);
INSERT INTO unique_tbl VALUES (0, 'one');
INSERT INTO unique_tbl VALUES (1, 'two');
INSERT INTO unique_tbl VALUES (2, 'tree');
INSERT INTO unique_tbl VALUES (3, 'four');
INSERT INTO unique_tbl VALUES (4, 'five');
BEGIN;
-- default is immediate so this should fail right away
UPDATE unique_tbl SET i = 1 WHERE i = 0;
ROLLBACK;
-- check is done at end of statement, so this should succeed
UPDATE unique_tbl SET i = i+1;
SELECT * FROM unique_tbl;
-- explicitly defer the constraint
BEGIN;
SET CONSTRAINTS unique_tbl_i_key DEFERRED;
INSERT INTO unique_tbl VALUES (3, 'three');
DELETE FROM unique_tbl WHERE t = 'tree'; -- makes constraint valid again
COMMIT; -- should succeed
SELECT * FROM unique_tbl;
-- try adding an initially deferred constraint
ALTER TABLE unique_tbl DROP CONSTRAINT unique_tbl_i_key;
ALTER TABLE unique_tbl ADD CONSTRAINT unique_tbl_i_key
UNIQUE (i) DEFERRABLE INITIALLY DEFERRED;
BEGIN;
INSERT INTO unique_tbl VALUES (1, 'five');
INSERT INTO unique_tbl VALUES (5, 'one');
UPDATE unique_tbl SET i = 4 WHERE i = 2;
UPDATE unique_tbl SET i = 2 WHERE i = 4 AND t = 'four';
DELETE FROM unique_tbl WHERE i = 1 AND t = 'one';
DELETE FROM unique_tbl WHERE i = 5 AND t = 'five';
COMMIT;
SELECT * FROM unique_tbl;
-- should fail at commit-time
BEGIN;
INSERT INTO unique_tbl VALUES (3, 'Three'); -- should succeed for now
COMMIT; -- should fail
-- make constraint check immediate
BEGIN;
SET CONSTRAINTS ALL IMMEDIATE;
INSERT INTO unique_tbl VALUES (3, 'Three'); -- should fail
COMMIT;
-- forced check when SET CONSTRAINTS is called
BEGIN;
SET CONSTRAINTS ALL DEFERRED;
INSERT INTO unique_tbl VALUES (3, 'Three'); -- should succeed for now
SET CONSTRAINTS ALL IMMEDIATE; -- should fail
COMMIT;
-- test deferrable UNIQUE with a partitioned table
CREATE TABLE parted_uniq_tbl (i int UNIQUE DEFERRABLE) partition by range (i);
CREATE TABLE parted_uniq_tbl_1 PARTITION OF parted_uniq_tbl FOR VALUES FROM (0) TO (10);
CREATE TABLE parted_uniq_tbl_2 PARTITION OF parted_uniq_tbl FOR VALUES FROM (20) TO (30);
SELECT conname, conrelid::regclass FROM pg_constraint
WHERE conname LIKE 'parted_uniq%' ORDER BY conname;
BEGIN;
INSERT INTO parted_uniq_tbl VALUES (1);
SAVEPOINT f;
INSERT INTO parted_uniq_tbl VALUES (1); -- unique violation
ROLLBACK TO f;
SET CONSTRAINTS parted_uniq_tbl_i_key DEFERRED;
INSERT INTO parted_uniq_tbl VALUES (1); -- OK now, fail at commit
COMMIT;
DROP TABLE parted_uniq_tbl;
-- test naming a constraint in a partition when a conflict exists
CREATE TABLE parted_fk_naming (
id bigint NOT NULL default 1,
id_abc bigint,
CONSTRAINT dummy_constr FOREIGN KEY (id_abc)
REFERENCES parted_fk_naming (id),
PRIMARY KEY (id)
)
PARTITION BY LIST (id);
CREATE TABLE parted_fk_naming_1 (
id bigint NOT NULL default 1,
id_abc bigint,
PRIMARY KEY (id),
CONSTRAINT dummy_constr CHECK (true)
);
ALTER TABLE parted_fk_naming ATTACH PARTITION parted_fk_naming_1 FOR VALUES IN ('1');
SELECT conname FROM pg_constraint WHERE conrelid = 'parted_fk_naming_1'::regclass AND contype = 'f';
DROP TABLE parted_fk_naming;
--
-- Test various ways to create primary keys on partitions, linked to unique
-- indexes (without constraints) on the partitioned table. Ideally these should
-- fail, but we don't dare change released behavior, so instead cope with it at
-- DETACH time.
CREATE TEMP TABLE t (a integer, b integer) PARTITION BY HASH (a, b);
CREATE TEMP TABLE tp (a integer, b integer, PRIMARY KEY (a, b), UNIQUE (b, a));
ALTER TABLE t ATTACH PARTITION tp FOR VALUES WITH (MODULUS 1, REMAINDER 0);
CREATE UNIQUE INDEX t_a_idx ON t (a, b);
CREATE UNIQUE INDEX t_b_idx ON t (b, a);
ALTER INDEX t_a_idx ATTACH PARTITION tp_pkey;
ALTER INDEX t_b_idx ATTACH PARTITION tp_b_a_key;
SELECT conname, conparentid, conislocal, coninhcount
FROM pg_constraint WHERE conname IN ('tp_pkey', 'tp_b_a_key')
ORDER BY conname DESC;
ALTER TABLE t DETACH PARTITION tp;
DROP TABLE t, tp;
CREATE TEMP TABLE t (a integer) PARTITION BY LIST (a);
CREATE TEMP TABLE tp (a integer PRIMARY KEY);
CREATE UNIQUE INDEX t_a_idx ON t (a);
ALTER TABLE t ATTACH PARTITION tp FOR VALUES IN (1);
ALTER TABLE t DETACH PARTITION tp;
DROP TABLE t, tp;
CREATE TEMP TABLE t (a integer) PARTITION BY LIST (a);
CREATE TEMP TABLE tp (a integer PRIMARY KEY);
CREATE UNIQUE INDEX t_a_idx ON ONLY t (a);
ALTER TABLE t ATTACH PARTITION tp FOR VALUES IN (1);
ALTER TABLE t DETACH PARTITION tp;
DROP TABLE t, tp;
CREATE TABLE regress_constr_partitioned (a integer) PARTITION BY LIST (a);
CREATE TABLE regress_constr_partition1 PARTITION OF regress_constr_partitioned FOR VALUES IN (1);
ALTER TABLE regress_constr_partition1 ADD PRIMARY KEY (a);
CREATE UNIQUE INDEX ON regress_constr_partitioned (a);
BEGIN;
ALTER TABLE regress_constr_partitioned DETACH PARTITION regress_constr_partition1;
ROLLBACK;
-- Leave this one in funny state for pg_upgrade testing
-- test a HOT update that invalidates the conflicting tuple.
-- the trigger should still fire and catch the violation
BEGIN;
INSERT INTO unique_tbl VALUES (3, 'Three'); -- should succeed for now
UPDATE unique_tbl SET t = 'THREE' WHERE i = 3 AND t = 'Three';
COMMIT; -- should fail
SELECT * FROM unique_tbl;
-- test a HOT update that modifies the newly inserted tuple,
-- but should succeed because we then remove the other conflicting tuple.
BEGIN;
INSERT INTO unique_tbl VALUES(3, 'tree'); -- should succeed for now
UPDATE unique_tbl SET t = 'threex' WHERE t = 'tree';
DELETE FROM unique_tbl WHERE t = 'three';
SELECT * FROM unique_tbl;
COMMIT;
SELECT * FROM unique_tbl;
DROP TABLE unique_tbl;
--
-- EXCLUDE constraints
--
CREATE TABLE circles (
c1 CIRCLE,
c2 TEXT,
EXCLUDE USING gist
(c1 WITH &&, (c2::circle) WITH &&)
WHERE (circle_center(c1) <> '(0,0)')
);
-- these should succeed because they don't match the index predicate
INSERT INTO circles VALUES('<(0,0), 5>', '<(0,0), 5>');
INSERT INTO circles VALUES('<(0,0), 5>', '<(0,0), 4>');
-- succeed
INSERT INTO circles VALUES('<(10,10), 10>', '<(0,0), 5>');
-- fail, overlaps
INSERT INTO circles VALUES('<(20,20), 10>', '<(0,0), 4>');
-- succeed, because violation is ignored
INSERT INTO circles VALUES('<(20,20), 10>', '<(0,0), 4>')
ON CONFLICT ON CONSTRAINT circles_c1_c2_excl DO NOTHING;
-- fail, because DO UPDATE variant requires unique index
INSERT INTO circles VALUES('<(20,20), 10>', '<(0,0), 4>')
ON CONFLICT ON CONSTRAINT circles_c1_c2_excl DO UPDATE SET c2 = EXCLUDED.c2;
-- succeed because c1 doesn't overlap
INSERT INTO circles VALUES('<(20,20), 1>', '<(0,0), 5>');
-- succeed because c2 doesn't overlap
INSERT INTO circles VALUES('<(20,20), 10>', '<(10,10), 5>');
-- should fail on existing data without the WHERE clause
ALTER TABLE circles ADD EXCLUDE USING gist
(c1 WITH &&, (c2::circle) WITH &&);
-- try reindexing an existing constraint
REINDEX INDEX circles_c1_c2_excl;
DROP TABLE circles;
-- Check deferred exclusion constraint
CREATE TABLE deferred_excl (
f1 int,
f2 int,
CONSTRAINT deferred_excl_con EXCLUDE (f1 WITH =) INITIALLY DEFERRED
);
INSERT INTO deferred_excl VALUES(1);
INSERT INTO deferred_excl VALUES(2);
INSERT INTO deferred_excl VALUES(1); -- fail
INSERT INTO deferred_excl VALUES(1) ON CONFLICT ON CONSTRAINT deferred_excl_con DO NOTHING; -- fail
BEGIN;
INSERT INTO deferred_excl VALUES(2); -- no fail here
COMMIT; -- should fail here
BEGIN;
INSERT INTO deferred_excl VALUES(3);
INSERT INTO deferred_excl VALUES(3); -- no fail here
COMMIT; -- should fail here
-- bug #13148: deferred constraint versus HOT update
BEGIN;
INSERT INTO deferred_excl VALUES(2, 1); -- no fail here
DELETE FROM deferred_excl WHERE f1 = 2 AND f2 IS NULL; -- remove old row
UPDATE deferred_excl SET f2 = 2 WHERE f1 = 2;
COMMIT; -- should not fail
SELECT * FROM deferred_excl;
ALTER TABLE deferred_excl DROP CONSTRAINT deferred_excl_con;
-- This should fail, but worth testing because of HOT updates
UPDATE deferred_excl SET f1 = 3;
ALTER TABLE deferred_excl ADD EXCLUDE (f1 WITH =);
DROP TABLE deferred_excl;
-- Comments
-- Setup a low-level role to enforce non-superuser checks.
CREATE ROLE regress_constraint_comments;
SET SESSION AUTHORIZATION regress_constraint_comments;
CREATE TABLE constraint_comments_tbl (a int CONSTRAINT the_constraint CHECK (a > 0));
CREATE DOMAIN constraint_comments_dom AS int CONSTRAINT the_constraint CHECK (value > 0);
COMMENT ON CONSTRAINT the_constraint ON constraint_comments_tbl IS 'yes, the comment';
COMMENT ON CONSTRAINT the_constraint ON DOMAIN constraint_comments_dom IS 'yes, another comment';
-- no such constraint
COMMENT ON CONSTRAINT no_constraint ON constraint_comments_tbl IS 'yes, the comment';
COMMENT ON CONSTRAINT no_constraint ON DOMAIN constraint_comments_dom IS 'yes, another comment';
-- no such table/domain
COMMENT ON CONSTRAINT the_constraint ON no_comments_tbl IS 'bad comment';
COMMENT ON CONSTRAINT the_constraint ON DOMAIN no_comments_dom IS 'another bad comment';
COMMENT ON CONSTRAINT the_constraint ON constraint_comments_tbl IS NULL;
COMMENT ON CONSTRAINT the_constraint ON DOMAIN constraint_comments_dom IS NULL;
-- unauthorized user
RESET SESSION AUTHORIZATION;
CREATE ROLE regress_constraint_comments_noaccess;
SET SESSION AUTHORIZATION regress_constraint_comments_noaccess;
COMMENT ON CONSTRAINT the_constraint ON constraint_comments_tbl IS 'no, the comment';
COMMENT ON CONSTRAINT the_constraint ON DOMAIN constraint_comments_dom IS 'no, another comment';
RESET SESSION AUTHORIZATION;
DROP TABLE constraint_comments_tbl;
DROP DOMAIN constraint_comments_dom;
DROP ROLE regress_constraint_comments;
DROP ROLE regress_constraint_comments_noaccess;
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