-- -- Test inheritance features -- CREATE TABLE a (aa TEXT); CREATE TABLE b (bb TEXT) INHERITS (a); CREATE TABLE c (cc TEXT) INHERITS (a); CREATE TABLE d (dd TEXT) INHERITS (b,c,a); NOTICE: merging multiple inherited definitions of column "aa" NOTICE: merging multiple inherited definitions of column "aa" INSERT INTO a(aa) VALUES('aaa'); INSERT INTO a(aa) VALUES('aaaa'); INSERT INTO a(aa) VALUES('aaaaa'); INSERT INTO a(aa) VALUES('aaaaaa'); INSERT INTO a(aa) VALUES('aaaaaaa'); INSERT INTO a(aa) VALUES('aaaaaaaa'); INSERT INTO b(aa) VALUES('bbb'); INSERT INTO b(aa) VALUES('bbbb'); INSERT INTO b(aa) VALUES('bbbbb'); INSERT INTO b(aa) VALUES('bbbbbb'); INSERT INTO b(aa) VALUES('bbbbbbb'); INSERT INTO b(aa) VALUES('bbbbbbbb'); INSERT INTO c(aa) VALUES('ccc'); INSERT INTO c(aa) VALUES('cccc'); INSERT INTO c(aa) VALUES('ccccc'); INSERT INTO c(aa) VALUES('cccccc'); INSERT INTO c(aa) VALUES('ccccccc'); INSERT INTO c(aa) VALUES('cccccccc'); INSERT INTO d(aa) VALUES('ddd'); INSERT INTO d(aa) VALUES('dddd'); INSERT INTO d(aa) VALUES('ddddd'); INSERT INTO d(aa) VALUES('dddddd'); INSERT INTO d(aa) VALUES('ddddddd'); INSERT INTO d(aa) VALUES('dddddddd'); SELECT relname, a.* FROM a, pg_class where a.tableoid = pg_class.oid; relname | aa ---------+---------- a | aaa a | aaaa a | aaaaa a | aaaaaa a | aaaaaaa a | aaaaaaaa b | bbb b | bbbb b | bbbbb b | bbbbbb b | bbbbbbb b | bbbbbbbb c | ccc c | cccc c | ccccc c | cccccc c | ccccccc c | cccccccc d | ddd d | dddd d | ddddd d | dddddd d | ddddddd d | dddddddd (24 rows) SELECT relname, b.* FROM b, pg_class where b.tableoid = pg_class.oid; relname | aa | bb ---------+----------+---- b | bbb | b | bbbb | b | bbbbb | b | bbbbbb | b | bbbbbbb | b | bbbbbbbb | d | ddd | d | dddd | d | ddddd | d | dddddd | d | ddddddd | d | dddddddd | (12 rows) SELECT relname, c.* FROM c, pg_class where c.tableoid = pg_class.oid; relname | aa | cc ---------+----------+---- c | ccc | c | cccc | c | ccccc | c | cccccc | c | ccccccc | c | cccccccc | d | ddd | d | dddd | d | ddddd | d | dddddd | d | ddddddd | d | dddddddd | (12 rows) SELECT relname, d.* FROM d, pg_class where d.tableoid = pg_class.oid; relname | aa | bb | cc | dd ---------+----------+----+----+---- d | ddd | | | d | dddd | | | d | ddddd | | | d | dddddd | | | d | ddddddd | | | d | dddddddd | | | (6 rows) SELECT relname, a.* FROM ONLY a, pg_class where a.tableoid = pg_class.oid; relname | aa ---------+---------- a | aaa a | aaaa a | aaaaa a | aaaaaa a | aaaaaaa a | aaaaaaaa (6 rows) SELECT relname, b.* FROM ONLY b, pg_class where b.tableoid = pg_class.oid; relname | aa | bb ---------+----------+---- b | bbb | b | bbbb | b | bbbbb | b | bbbbbb | b | bbbbbbb | b | bbbbbbbb | (6 rows) SELECT relname, c.* FROM ONLY c, pg_class where c.tableoid = pg_class.oid; relname | aa | cc ---------+----------+---- c | ccc | c | cccc | c | ccccc | c | cccccc | c | ccccccc | c | cccccccc | (6 rows) SELECT relname, d.* FROM ONLY d, pg_class where d.tableoid = pg_class.oid; relname | aa | bb | cc | dd ---------+----------+----+----+---- d | ddd | | | d | dddd | | | d | ddddd | | | d | dddddd | | | d | ddddddd | | | d | dddddddd | | | (6 rows) UPDATE a SET aa='zzzz' WHERE aa='aaaa'; UPDATE ONLY a SET aa='zzzzz' WHERE aa='aaaaa'; UPDATE b SET aa='zzz' WHERE aa='aaa'; UPDATE ONLY b SET aa='zzz' WHERE aa='aaa'; UPDATE a SET aa='zzzzzz' WHERE aa LIKE 'aaa%'; SELECT relname, a.* FROM a, pg_class where a.tableoid = pg_class.oid; relname | aa ---------+---------- a | zzzz a | zzzzz a | zzzzzz a | zzzzzz a | zzzzzz a | zzzzzz b | bbb b | bbbb b | bbbbb b | bbbbbb b | bbbbbbb b | bbbbbbbb c | ccc c | cccc c | ccccc c | cccccc c | ccccccc c | cccccccc d | ddd d | dddd d | ddddd d | dddddd d | ddddddd d | dddddddd (24 rows) SELECT relname, b.* FROM b, pg_class where b.tableoid = pg_class.oid; relname | aa | bb ---------+----------+---- b | bbb | b | bbbb | b | bbbbb | b | bbbbbb | b | bbbbbbb | b | bbbbbbbb | d | ddd | d | dddd | d | ddddd | d | dddddd | d | ddddddd | d | dddddddd | (12 rows) SELECT relname, c.* FROM c, pg_class where c.tableoid = pg_class.oid; relname | aa | cc ---------+----------+---- c | ccc | c | cccc | c | ccccc | c | cccccc | c | ccccccc | c | cccccccc | d | ddd | d | dddd | d | ddddd | d | dddddd | d | ddddddd | d | dddddddd | (12 rows) SELECT relname, d.* FROM d, pg_class where d.tableoid = pg_class.oid; relname | aa | bb | cc | dd ---------+----------+----+----+---- d | ddd | | | d | dddd | | | d | ddddd | | | d | dddddd | | | d | ddddddd | | | d | dddddddd | | | (6 rows) SELECT relname, a.* FROM ONLY a, pg_class where a.tableoid = pg_class.oid; relname | aa ---------+-------- a | zzzz a | zzzzz a | zzzzzz a | zzzzzz a | zzzzzz a | zzzzzz (6 rows) SELECT relname, b.* FROM ONLY b, pg_class where b.tableoid = pg_class.oid; relname | aa | bb ---------+----------+---- b | bbb | b | bbbb | b | bbbbb | b | bbbbbb | b | bbbbbbb | b | bbbbbbbb | (6 rows) SELECT relname, c.* FROM ONLY c, pg_class where c.tableoid = pg_class.oid; relname | aa | cc ---------+----------+---- c | ccc | c | cccc | c | ccccc | c | cccccc | c | ccccccc | c | cccccccc | (6 rows) SELECT relname, d.* FROM ONLY d, pg_class where d.tableoid = pg_class.oid; relname | aa | bb | cc | dd ---------+----------+----+----+---- d | ddd | | | d | dddd | | | d | ddddd | | | d | dddddd | | | d | ddddddd | | | d | dddddddd | | | (6 rows) UPDATE b SET aa='new'; SELECT relname, a.* FROM a, pg_class where a.tableoid = pg_class.oid; relname | aa ---------+---------- a | zzzz a | zzzzz a | zzzzzz a | zzzzzz a | zzzzzz a | zzzzzz b | new b | new b | new b | new b | new b | new c | ccc c | cccc c | ccccc c | cccccc c | ccccccc c | cccccccc d | new d | new d | new d | new d | new d | new (24 rows) SELECT relname, b.* FROM b, pg_class where b.tableoid = pg_class.oid; relname | aa | bb ---------+-----+---- b | new | b | new | b | new | b | new | b | new | b | new | d | new | d | new | d | new | d | new | d | new | d | new | (12 rows) SELECT relname, c.* FROM c, pg_class where c.tableoid = pg_class.oid; relname | aa | cc ---------+----------+---- c | ccc | c | cccc | c | ccccc | c | cccccc | c | ccccccc | c | cccccccc | d | new | d | new | d | new | d | new | d | new | d | new | (12 rows) SELECT relname, d.* FROM d, pg_class where d.tableoid = pg_class.oid; relname | aa | bb | cc | dd ---------+-----+----+----+---- d | new | | | d | new | | | d | new | | | d | new | | | d | new | | | d | new | | | (6 rows) SELECT relname, a.* FROM ONLY a, pg_class where a.tableoid = pg_class.oid; relname | aa ---------+-------- a | zzzz a | zzzzz a | zzzzzz a | zzzzzz a | zzzzzz a | zzzzzz (6 rows) SELECT relname, b.* FROM ONLY b, pg_class where b.tableoid = pg_class.oid; relname | aa | bb ---------+-----+---- b | new | b | new | b | new | b | new | b | new | b | new | (6 rows) SELECT relname, c.* FROM ONLY c, pg_class where c.tableoid = pg_class.oid; relname | aa | cc ---------+----------+---- c | ccc | c | cccc | c | ccccc | c | cccccc | c | ccccccc | c | cccccccc | (6 rows) SELECT relname, d.* FROM ONLY d, pg_class where d.tableoid = pg_class.oid; relname | aa | bb | cc | dd ---------+-----+----+----+---- d | new | | | d | new | | | d | new | | | d | new | | | d | new | | | d | new | | | (6 rows) UPDATE a SET aa='new'; DELETE FROM ONLY c WHERE aa='new'; SELECT relname, a.* FROM a, pg_class where a.tableoid = pg_class.oid; relname | aa ---------+----- a | new a | new a | new a | new a | new a | new b | new b | new b | new b | new b | new b | new d | new d | new d | new d | new d | new d | new (18 rows) SELECT relname, b.* FROM b, pg_class where b.tableoid = pg_class.oid; relname | aa | bb ---------+-----+---- b | new | b | new | b | new | b | new | b | new | b | new | d | new | d | new | d | new | d | new | d | new | d | new | (12 rows) SELECT relname, c.* FROM c, pg_class where c.tableoid = pg_class.oid; relname | aa | cc ---------+-----+---- d | new | d | new | d | new | d | new | d | new | d | new | (6 rows) SELECT relname, d.* FROM d, pg_class where d.tableoid = pg_class.oid; relname | aa | bb | cc | dd ---------+-----+----+----+---- d | new | | | d | new | | | d | new | | | d | new | | | d | new | | | d | new | | | (6 rows) SELECT relname, a.* FROM ONLY a, pg_class where a.tableoid = pg_class.oid; relname | aa ---------+----- a | new a | new a | new a | new a | new a | new (6 rows) SELECT relname, b.* FROM ONLY b, pg_class where b.tableoid = pg_class.oid; relname | aa | bb ---------+-----+---- b | new | b | new | b | new | b | new | b | new | b | new | (6 rows) SELECT relname, c.* FROM ONLY c, pg_class where c.tableoid = pg_class.oid; relname | aa | cc ---------+----+---- (0 rows) SELECT relname, d.* FROM ONLY d, pg_class where d.tableoid = pg_class.oid; relname | aa | bb | cc | dd ---------+-----+----+----+---- d | new | | | d | new | | | d | new | | | d | new | | | d | new | | | d | new | | | (6 rows) DELETE FROM a; SELECT relname, a.* FROM a, pg_class where a.tableoid = pg_class.oid; relname | aa ---------+---- (0 rows) SELECT relname, b.* FROM b, pg_class where b.tableoid = pg_class.oid; relname | aa | bb ---------+----+---- (0 rows) SELECT relname, c.* FROM c, pg_class where c.tableoid = pg_class.oid; relname | aa | cc ---------+----+---- (0 rows) SELECT relname, d.* FROM d, pg_class where d.tableoid = pg_class.oid; relname | aa | bb | cc | dd ---------+----+----+----+---- (0 rows) SELECT relname, a.* FROM ONLY a, pg_class where a.tableoid = pg_class.oid; relname | aa ---------+---- (0 rows) SELECT relname, b.* FROM ONLY b, pg_class where b.tableoid = pg_class.oid; relname | aa | bb ---------+----+---- (0 rows) SELECT relname, c.* FROM ONLY c, pg_class where c.tableoid = pg_class.oid; relname | aa | cc ---------+----+---- (0 rows) SELECT relname, d.* FROM ONLY d, pg_class where d.tableoid = pg_class.oid; relname | aa | bb | cc | dd ---------+----+----+----+---- (0 rows) -- Confirm PRIMARY KEY adds NOT NULL constraint to child table CREATE TEMP TABLE z (b TEXT, PRIMARY KEY(aa, b)) inherits (a); NOTICE: CREATE TABLE / PRIMARY KEY will create implicit index "z_pkey" for table "z" INSERT INTO z VALUES (NULL, 'text'); -- should fail ERROR: null value in column "aa" violates not-null constraint -- Check UPDATE with inherited target and an inherited source table create temp table foo(f1 int, f2 int); create temp table foo2(f3 int) inherits (foo); create temp table bar(f1 int, f2 int); create temp table bar2(f3 int) inherits (bar); insert into foo values(1,1); insert into foo values(3,3); insert into foo2 values(2,2,2); insert into foo2 values(3,3,3); insert into bar values(1,1); insert into bar values(2,2); insert into bar values(3,3); insert into bar values(4,4); insert into bar2 values(1,1,1); insert into bar2 values(2,2,2); insert into bar2 values(3,3,3); insert into bar2 values(4,4,4); update bar set f2 = f2 + 100 where f1 in (select f1 from foo); SELECT relname, bar.* FROM bar, pg_class where bar.tableoid = pg_class.oid order by 1,2; relname | f1 | f2 ---------+----+----- bar | 1 | 101 bar | 2 | 102 bar | 3 | 103 bar | 4 | 4 bar2 | 1 | 101 bar2 | 2 | 102 bar2 | 3 | 103 bar2 | 4 | 4 (8 rows) /* Test multiple inheritance of column defaults */ CREATE TABLE firstparent (tomorrow date default now()::date + 1); CREATE TABLE secondparent (tomorrow date default now() :: date + 1); CREATE TABLE jointchild () INHERITS (firstparent, secondparent); -- ok NOTICE: merging multiple inherited definitions of column "tomorrow" CREATE TABLE thirdparent (tomorrow date default now()::date - 1); CREATE TABLE otherchild () INHERITS (firstparent, thirdparent); -- not ok NOTICE: merging multiple inherited definitions of column "tomorrow" ERROR: column "tomorrow" inherits conflicting default values HINT: To resolve the conflict, specify a default explicitly. CREATE TABLE otherchild (tomorrow date default now()) INHERITS (firstparent, thirdparent); -- ok, child resolves ambiguous default NOTICE: merging multiple inherited definitions of column "tomorrow" NOTICE: merging column "tomorrow" with inherited definition DROP TABLE firstparent, secondparent, jointchild, thirdparent, otherchild; /* Test inheritance of structure (LIKE) */ CREATE TABLE inhx (xx text DEFAULT 'text'); /* * Test double inheritance * * Ensure that defaults are NOT included unless * INCLUDING DEFAULTS is specified */ CREATE TABLE inhe (ee text, LIKE inhx) inherits (b); INSERT INTO inhe VALUES ('ee-col1', 'ee-col2', DEFAULT, 'ee-col4'); SELECT * FROM inhe; /* Columns aa, bb, xx value NULL, ee */ aa | bb | ee | xx ---------+---------+----+--------- ee-col1 | ee-col2 | | ee-col4 (1 row) SELECT * FROM inhx; /* Empty set since LIKE inherits structure only */ xx ---- (0 rows) SELECT * FROM b; /* Has ee entry */ aa | bb ---------+--------- ee-col1 | ee-col2 (1 row) SELECT * FROM a; /* Has ee entry */ aa --------- ee-col1 (1 row) CREATE TABLE inhf (LIKE inhx, LIKE inhx); /* Throw error */ ERROR: column "xx" specified more than once CREATE TABLE inhf (LIKE inhx INCLUDING DEFAULTS INCLUDING CONSTRAINTS); INSERT INTO inhf DEFAULT VALUES; SELECT * FROM inhf; /* Single entry with value 'text' */ xx ------ text (1 row) ALTER TABLE inhx add constraint foo CHECK (xx = 'text'); ALTER TABLE inhx ADD PRIMARY KEY (xx); NOTICE: ALTER TABLE / ADD PRIMARY KEY will create implicit index "inhx_pkey" for table "inhx" CREATE TABLE inhg (LIKE inhx); /* Doesn't copy constraint */ INSERT INTO inhg VALUES ('foo'); DROP TABLE inhg; CREATE TABLE inhg (x text, LIKE inhx INCLUDING CONSTRAINTS, y text); /* Copies constraints */ INSERT INTO inhg VALUES ('x', 'text', 'y'); /* Succeeds */ INSERT INTO inhg VALUES ('x', 'text', 'y'); /* Succeeds -- Unique constraints not copied */ INSERT INTO inhg VALUES ('x', 'foo', 'y'); /* fails due to constraint */ ERROR: new row for relation "inhg" violates check constraint "foo" SELECT * FROM inhg; /* Two records with three columns in order x=x, xx=text, y=y */ x | xx | y ---+------+--- x | text | y x | text | y (2 rows) DROP TABLE inhg; CREATE TABLE inhg (x text, LIKE inhx INCLUDING INDEXES, y text); /* copies indexes */ NOTICE: CREATE TABLE / PRIMARY KEY will create implicit index "inhg_pkey" for table "inhg" INSERT INTO inhg VALUES (5, 10); INSERT INTO inhg VALUES (20, 10); -- should fail ERROR: duplicate key value violates unique constraint "inhg_pkey" DETAIL: Key (xx)=(10) already exists. DROP TABLE inhg; /* Multiple primary keys creation should fail */ CREATE TABLE inhg (x text, LIKE inhx INCLUDING INDEXES, PRIMARY KEY(x)); /* fails */ ERROR: multiple primary keys for table "inhg" are not allowed CREATE TABLE inhz (xx text DEFAULT 'text', yy int UNIQUE); NOTICE: CREATE TABLE / UNIQUE will create implicit index "inhz_yy_key" for table "inhz" CREATE UNIQUE INDEX inhz_xx_idx on inhz (xx) WHERE xx <> 'test'; /* Ok to create multiple unique indexes */ CREATE TABLE inhg (x text UNIQUE, LIKE inhz INCLUDING INDEXES); NOTICE: CREATE TABLE / UNIQUE will create implicit index "inhg_x_key" for table "inhg" NOTICE: CREATE TABLE / UNIQUE will create implicit index "inhg_yy_key" for table "inhg" INSERT INTO inhg (xx, yy, x) VALUES ('test', 5, 10); INSERT INTO inhg (xx, yy, x) VALUES ('test', 10, 15); INSERT INTO inhg (xx, yy, x) VALUES ('foo', 10, 15); -- should fail ERROR: duplicate key value violates unique constraint "inhg_x_key" DETAIL: Key (x)=(15) already exists. DROP TABLE inhg; DROP TABLE inhz; -- Test changing the type of inherited columns insert into d values('test','one','two','three'); alter table a alter column aa type integer using bit_length(aa); select * from d; aa | bb | cc | dd ----+-----+-----+------- 32 | one | two | three (1 row) -- Tests for casting between the rowtypes of parent and child -- tables. See the pgsql-hackers thread beginning Dec. 4/04 create table base (i integer); create table derived () inherits (base); insert into derived (i) values (0); select derived::base from derived; derived --------- (0) (1 row) drop table derived; drop table base; create table p1(ff1 int); create table p2(f1 text); create function p2text(p2) returns text as 'select $1.f1' language sql; create table c1(f3 int) inherits(p1,p2); insert into c1 values(123456789, 'hi', 42); select p2text(c1.*) from c1; p2text -------- hi (1 row) drop function p2text(p2); drop table c1; drop table p2; drop table p1; CREATE TABLE ac (aa TEXT); alter table ac add constraint ac_check check (aa is not null); CREATE TABLE bc (bb TEXT) INHERITS (ac); select pc.relname, pgc.conname, pgc.contype, pgc.conislocal, pgc.coninhcount, pgc.consrc from pg_class as pc inner join pg_constraint as pgc on (pgc.conrelid = pc.oid) where pc.relname in ('ac', 'bc') order by 1,2; relname | conname | contype | conislocal | coninhcount | consrc ---------+----------+---------+------------+-------------+------------------ ac | ac_check | c | t | 0 | (aa IS NOT NULL) bc | ac_check | c | f | 1 | (aa IS NOT NULL) (2 rows) insert into ac (aa) values (NULL); ERROR: new row for relation "ac" violates check constraint "ac_check" insert into bc (aa) values (NULL); ERROR: new row for relation "bc" violates check constraint "ac_check" alter table bc drop constraint ac_check; -- fail, disallowed ERROR: cannot drop inherited constraint "ac_check" of relation "bc" alter table ac drop constraint ac_check; select pc.relname, pgc.conname, pgc.contype, pgc.conislocal, pgc.coninhcount, pgc.consrc from pg_class as pc inner join pg_constraint as pgc on (pgc.conrelid = pc.oid) where pc.relname in ('ac', 'bc') order by 1,2; relname | conname | contype | conislocal | coninhcount | consrc ---------+---------+---------+------------+-------------+-------- (0 rows) -- try the unnamed-constraint case alter table ac add check (aa is not null); select pc.relname, pgc.conname, pgc.contype, pgc.conislocal, pgc.coninhcount, pgc.consrc from pg_class as pc inner join pg_constraint as pgc on (pgc.conrelid = pc.oid) where pc.relname in ('ac', 'bc') order by 1,2; relname | conname | contype | conislocal | coninhcount | consrc ---------+-------------+---------+------------+-------------+------------------ ac | ac_aa_check | c | t | 0 | (aa IS NOT NULL) bc | ac_aa_check | c | f | 1 | (aa IS NOT NULL) (2 rows) insert into ac (aa) values (NULL); ERROR: new row for relation "ac" violates check constraint "ac_aa_check" insert into bc (aa) values (NULL); ERROR: new row for relation "bc" violates check constraint "ac_aa_check" alter table bc drop constraint ac_aa_check; -- fail, disallowed ERROR: cannot drop inherited constraint "ac_aa_check" of relation "bc" alter table ac drop constraint ac_aa_check; select pc.relname, pgc.conname, pgc.contype, pgc.conislocal, pgc.coninhcount, pgc.consrc from pg_class as pc inner join pg_constraint as pgc on (pgc.conrelid = pc.oid) where pc.relname in ('ac', 'bc') order by 1,2; relname | conname | contype | conislocal | coninhcount | consrc ---------+---------+---------+------------+-------------+-------- (0 rows) alter table ac add constraint ac_check check (aa is not null); alter table bc no inherit ac; select pc.relname, pgc.conname, pgc.contype, pgc.conislocal, pgc.coninhcount, pgc.consrc from pg_class as pc inner join pg_constraint as pgc on (pgc.conrelid = pc.oid) where pc.relname in ('ac', 'bc') order by 1,2; relname | conname | contype | conislocal | coninhcount | consrc ---------+----------+---------+------------+-------------+------------------ ac | ac_check | c | t | 0 | (aa IS NOT NULL) bc | ac_check | c | t | 0 | (aa IS NOT NULL) (2 rows) alter table bc drop constraint ac_check; select pc.relname, pgc.conname, pgc.contype, pgc.conislocal, pgc.coninhcount, pgc.consrc from pg_class as pc inner join pg_constraint as pgc on (pgc.conrelid = pc.oid) where pc.relname in ('ac', 'bc') order by 1,2; relname | conname | contype | conislocal | coninhcount | consrc ---------+----------+---------+------------+-------------+------------------ ac | ac_check | c | t | 0 | (aa IS NOT NULL) (1 row) alter table ac drop constraint ac_check; select pc.relname, pgc.conname, pgc.contype, pgc.conislocal, pgc.coninhcount, pgc.consrc from pg_class as pc inner join pg_constraint as pgc on (pgc.conrelid = pc.oid) where pc.relname in ('ac', 'bc') order by 1,2; relname | conname | contype | conislocal | coninhcount | consrc ---------+---------+---------+------------+-------------+-------- (0 rows) drop table bc; drop table ac; create table ac (a int constraint check_a check (a <> 0)); create table bc (a int constraint check_a check (a <> 0), b int constraint check_b check (b <> 0)) inherits (ac); NOTICE: merging column "a" with inherited definition NOTICE: merging constraint "check_a" with inherited definition select pc.relname, pgc.conname, pgc.contype, pgc.conislocal, pgc.coninhcount, pgc.consrc from pg_class as pc inner join pg_constraint as pgc on (pgc.conrelid = pc.oid) where pc.relname in ('ac', 'bc') order by 1,2; relname | conname | contype | conislocal | coninhcount | consrc ---------+---------+---------+------------+-------------+---------- ac | check_a | c | t | 0 | (a <> 0) bc | check_a | c | t | 1 | (a <> 0) bc | check_b | c | t | 0 | (b <> 0) (3 rows) drop table bc; drop table ac; create table ac (a int constraint check_a check (a <> 0)); create table bc (b int constraint check_b check (b <> 0)); create table cc (c int constraint check_c check (c <> 0)) inherits (ac, bc); select pc.relname, pgc.conname, pgc.contype, pgc.conislocal, pgc.coninhcount, pgc.consrc from pg_class as pc inner join pg_constraint as pgc on (pgc.conrelid = pc.oid) where pc.relname in ('ac', 'bc', 'cc') order by 1,2; relname | conname | contype | conislocal | coninhcount | consrc ---------+---------+---------+------------+-------------+---------- ac | check_a | c | t | 0 | (a <> 0) bc | check_b | c | t | 0 | (b <> 0) cc | check_a | c | f | 1 | (a <> 0) cc | check_b | c | f | 1 | (b <> 0) cc | check_c | c | t | 0 | (c <> 0) (5 rows) alter table cc no inherit bc; select pc.relname, pgc.conname, pgc.contype, pgc.conislocal, pgc.coninhcount, pgc.consrc from pg_class as pc inner join pg_constraint as pgc on (pgc.conrelid = pc.oid) where pc.relname in ('ac', 'bc', 'cc') order by 1,2; relname | conname | contype | conislocal | coninhcount | consrc ---------+---------+---------+------------+-------------+---------- ac | check_a | c | t | 0 | (a <> 0) bc | check_b | c | t | 0 | (b <> 0) cc | check_a | c | f | 1 | (a <> 0) cc | check_b | c | t | 0 | (b <> 0) cc | check_c | c | t | 0 | (c <> 0) (5 rows) drop table cc; drop table bc; drop table ac; create table p1(f1 int); create table p2(f2 int); create table c1(f3 int) inherits(p1,p2); insert into c1 values(1,-1,2); alter table p2 add constraint cc check (f2>0); -- fail ERROR: check constraint "cc" is violated by some row alter table p2 add check (f2>0); -- check it without a name, too ERROR: check constraint "p2_f2_check" is violated by some row delete from c1; insert into c1 values(1,1,2); alter table p2 add check (f2>0); insert into c1 values(1,-1,2); -- fail ERROR: new row for relation "c1" violates check constraint "p2_f2_check" create table c2(f3 int) inherits(p1,p2); \d c2 Table "public.c2" Column | Type | Modifiers --------+---------+----------- f1 | integer | f2 | integer | f3 | integer | Check constraints: "p2_f2_check" CHECK (f2 > 0) Inherits: p1, p2 create table c3 (f4 int) inherits(c1,c2); NOTICE: merging multiple inherited definitions of column "f1" NOTICE: merging multiple inherited definitions of column "f2" NOTICE: merging multiple inherited definitions of column "f3" \d c3 Table "public.c3" Column | Type | Modifiers --------+---------+----------- f1 | integer | f2 | integer | f3 | integer | f4 | integer | Check constraints: "p2_f2_check" CHECK (f2 > 0) Inherits: c1, c2 drop table p1 cascade; NOTICE: drop cascades to 3 other objects DETAIL: drop cascades to table c1 drop cascades to table c2 drop cascades to table c3 drop table p2 cascade; create table pp1 (f1 int); create table cc1 (f2 text, f3 int) inherits (pp1); alter table pp1 add column a1 int check (a1 > 0); \d cc1 Table "public.cc1" Column | Type | Modifiers --------+---------+----------- f1 | integer | f2 | text | f3 | integer | a1 | integer | Check constraints: "pp1_a1_check" CHECK (a1 > 0) Inherits: pp1 create table cc2(f4 float) inherits(pp1,cc1); NOTICE: merging multiple inherited definitions of column "f1" NOTICE: merging multiple inherited definitions of column "a1" \d cc2 Table "public.cc2" Column | Type | Modifiers --------+------------------+----------- f1 | integer | a1 | integer | f2 | text | f3 | integer | f4 | double precision | Check constraints: "pp1_a1_check" CHECK (a1 > 0) Inherits: pp1, cc1 alter table pp1 add column a2 int check (a2 > 0); NOTICE: merging definition of column "a2" for child "cc2" NOTICE: merging constraint "pp1_a2_check" with inherited definition \d cc2 Table "public.cc2" Column | Type | Modifiers --------+------------------+----------- f1 | integer | a1 | integer | f2 | text | f3 | integer | f4 | double precision | a2 | integer | Check constraints: "pp1_a1_check" CHECK (a1 > 0) "pp1_a2_check" CHECK (a2 > 0) Inherits: pp1, cc1 drop table pp1 cascade; NOTICE: drop cascades to 2 other objects DETAIL: drop cascades to table cc1 drop cascades to table cc2